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ORGANIC SPECTROSCOPY

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DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with AFRICURE PHARMA, ROW2TECH, NIPER-G, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Govt. of India as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 32 PLUS year tenure till date Feb 2023, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, He makes himself available to all, contact him on +91 9323115463, email amcrasto@gmail.com, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 38 lakh plus views on New Drug Approvals Blog in 227 countries......https://newdrugapprovals.wordpress.com/ , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc He has total of 32 International and Indian awards

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DOMPERIDONE


Domperidone
ChemSpider 2D Image | Domperidone | C22H24ClN5O2
Domperidone 2D structure.svg

DOMPERIDONE

  • Molecular FormulaC22H24ClN5O2
  • Average mass425.911 Da

1H-Benzimidazol-2-ol, 5-chloro-1-[1-[3-(2-hydroxy-1H-benzimidazol-1-yl)propyl]-4-piperidinyl]-
260-968-7[EINECS]
2H-Benzimidazol-2-one, 5-chloro-1-[1-[3-(2,3-dihydro-2-oxo-1H-benzimidazol-1-yl)propyl]-4-piperidinyl]-1,3-dihydro-
4-(5-Chloro-2-oxo-1-benzimidazolinyl)-1-[3-(2-oxobenzimidazolinyl)propyl]piperidine
57808-66-9[RN]домперидон 
دومبيريدون 
多潘立酮 
CAS Registry Number: 57808-66-9 
CAS Name: 5-Chloro-1-[1-[3-(2,3-dihydro-2-oxo-1H-benzimidazol-1-yl)propyl]-4-piperidinyl]-1,3-dihydro-2H-benzimidazol-2-one 
Additional Names: 5-chloro-1-[1-[3-(2-oxo-1-benzimidazolinyl)propyl]-4-piperidyl]-2-benzimidazolinone 
Manufacturers’ Codes: R-33812 
Trademarks: Euciton (Roux-Ocefa); Evoxin (Sterling Winthrop); Gastronorm (Janssen); Mod (Irbi); Motilium (Janssen); Nauzelin (Janssen); Peridon (Italchimici); Peridys (Robapharm) 
Molecular Formula: C22H24ClN5O2 
Molecular Weight: 425.91 
Percent Composition: C 62.04%, H 5.68%, Cl 8.32%, N 16.44%, O 7.51% 
Literature References: A novel in vitro dopamine antagonist with antinauseant properties.Prepn: J. Vandenberk et al.,DE2632870eidem,US4066772 (1977, 1978 both to Janssen). Pharmacology: C. Ennis et al.,J. Pharm. Pharmacol.31, Suppl., 14P (1979). Gastrokinetic properties: J. M. Van Neuten et al.,Life Sci.23, 453 (1978). 3H-domperidone studies: M. P. Martres et al.,ibid. 1781; M. Baudry et al.,Arch. Pharmacol.308, 231 (1979). Clinical studies: A. J. Reyntjens et al.,Arzneim.-Forsch.28, 1194 (1978); D. B. Wilson, J. W. Dundee, Anaesthesia34, 765 (1979). Review of pharmacology, pharmacokinetics and therapeutic efficacy: R. N. Brogden et al.,Drugs24, 360-400 (1982). 
Properties: Crystals from DMF/water, mp 242.5°. 
Melting point: mp 242.5° 
Therap-Cat: Antiemetic. 
Keywords: Antiemetic; Dopamine Receptor Antagonist.

Domperidone, sold under the brand name Motilium among others, is a medication used as an antiemeticgastric prokinetic agent, and galactagogue.[1][6][7] It may be taken by mouth or rectally, and is available as a tabletorally disintegrating tablets,[8] suspension, and suppositories.[9] The drug is used to relieve nausea and vomiting; to increase the transit of food through the stomach (by increasing gastrointestinal peristalsis); and to promote lactation (breast milk production) by release of prolactin.[1][7]

It is a peripherally selective dopamine D2 receptor antagonist and was developed by Janssen Pharmaceutica.

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syn

Prepn: J. Vandenberk et al., DE 2632870; eidem, US 4066772 (1977, 1978 both to Janssen).

File:Domperidone synthesis.svg

syn

Ruben Vardanyan, in Piperidine-Based Drug Discovery, 2017

Domperidone (5565)

Domperidone (7.1.6) (Motilium), a peripherally selective D2-like receptor antagonist, regulates the motility of the gastric and small intestinal smooth muscles and has been shown to have some effects on the motor function of the esophagus. It effectively prevents bile reflux but does not affect gastric secretion. As a result of the blockade of dopamine receptors in the chemoreceptor trigger zone it also has an antiemetic activity. Domperiodone provided relief of such symptoms as anorexia, nausea, vomiting, abdominal pain, early satiety, bloating, and distension in patients with symptoms of diabetic gastropathy. It also provided short-term relief of symptoms in patients with dyspepsia or gastroesophageal reflux, prevented nausea and vomiting associated with emetogenic chemotherapy, and prevented the gastrointestinal and emetic adverse effects of antiparkinsonian drugs. Because domperidone does not readily cross the blood brain barrier and does not inhibit dopamine receptors in the brain, reports of adverse effects on the CNS, such as dystonic reactions, are rare [52–61]. Domperidone is widely used in many countries and can now be officially prescribed to patients in the United States. There are very few treatment options currently available for patients with gastrointestinal motility disorders, especially for patients with gastroparesis. Domperidone has been successfully used in the United States and in many countries as a second-line treatment option for the treatment of gastroparesis.

Synthesis of domperidone (7.1.6) started with arylation of ethyl 4-aminopiperidine-1-carboxylate (7.1.28) with 1,4-dichloro-2-nitrobenzene (7.1.29) on heating at 150°C in cyclohexanol in the presence of sodium carbonate and potassium iodide (in a later disclosure in toluene in presence of sodium carbonate [62]) to give compound (7.1.30), which on reflux in 48% hydrobromic acid solution yielded N-(4-chloro-2-nitrophenyl)piperidin-4-amine (7.1.31). The obtained product was alkylated with 1-(3-chloropropyl)-1,3-dihydro-2H-benzo[d]imidazol-2-one (7.1.32) on reflux in MBIK in the presence of sodium carbonate and potassium iodide to give compound (7.1.33). The ring closure could be effected by heating o-phenylene diamine (7.1.33) with an appropriate cyclizing agent, such as phosgene, urea, potassium isocyanate [63], and the like. In this patent potassium isocyanate dissolved in water was carefully added to a solution of compound (7.1.34) in 10 N hydrochloric acid solution (exothermic reaction) to give desired domperidone (7.1.6) [64,65] (Scheme 7.4).

Medical uses

Nausea and vomiting

There is some evidence that domperidone has antiemetic activity.[10] It is recommended by the Canadian Headache Society for treatment of nausea associated with acute migraine.[11]

Gastroparesis

Gastroparesis is a medical condition characterised by delayed emptying of the stomach when there is no mechanical gastric outlet obstruction. Its cause is most commonly idiopathic, a diabetic complication or a result of abdominal surgery. The condition causes nausea, vomiting, fullness after eating, early satiety (feeling full before the meal is finished), abdominal pain and bloating.

Domperidone may be useful in diabetic and idiopathic gastroparesis.[12][13]

However, increased rate of gastric emptying induced by drugs like domperidone does not always correlate (equate) well with relief of symptoms.[14]

Parkinson’s disease

Parkinson’s disease is a chronic neurological condition where a decrease in dopamine in the brain leads to rigidity (stiffness of movement), tremor and other symptoms and signs. Poor gastrointestinal function, nausea and vomiting is a major problem for people with Parkinson’s disease because most medications used to treat Parkinson’s disease are given by mouth. These medications, such as levodopa, can cause nausea as a side effect. Furthermore, anti-nausea drugs, such as metoclopramide, which do cross the blood–brain barrier may worsen the extra-pyramidal symptoms of Parkinson’s disease.

Domperidone can be used to relieve gastrointestinal symptoms in Parkinson’s disease; it blocks peripheral D2 receptors but does not cross the blood–brain barrier in normal doses (the barrier between the blood circulation of the brain and the rest of the body) so has no effect on the extrapyramidal symptoms of the disease.[15]

Functional dyspepsia

Domperidone may be used in functional dyspepsia in both adults and children.[16][17]

Lactation

The hormone prolactin stimulates lactation (production of breast milk). Dopamine, released by the hypothalamus stops the release of prolactin from the pituitary gland. Domperidone, by acting as an anti-dopaminergic agent, results in increased prolactin secretion, and thus promotes lactation (that is, it is a galactogogue). Domperidone moderately increases the volume of expressed breast milk in mothers of preterm babies where breast milk expression was inadequate, and appears to be safe for short-term use for this purpose.[18][19][20] In the United States, domperidone is not approved for this or any other use.[21][22]

A study called the EMPOWER trial was designed to assess the effectiveness and safety of domperidone in assisting mothers of preterm babies to supply breast milk for their infants.[23] The study randomized 90 mothers of preterm babies to receive either domperidone 10 mg orally three times daily for 28 days (Group A) or placebo 10 mg orally three times daily for 14 days followed by domperidone 10 mg orally three times daily for 14 days (Group B). Mean milk volumes at the beginning of the intervention were similar between the 2 groups. After the first 14 days, 78% of mothers receiving domperidone (Group A) achieved a 50% increase in milk volume, while 58% of mothers receiving placebo (Group B) achieved a 50% increase in milk volume.[24]

To induce lactation, domperidone is used at a dosage of 10 to 20 mg 3 or 4 times per day by mouth.[25] Effects may be seen within 24 hours or may not be seen for 3 or 4 days.[25] The maximum effect occurs after 2 or 3 weeks of treatment, and the treatment period generally lasts for 3 to 8 weeks.[25] A 2012 review shows that no studies support prophylactic use of a galactagogue medication at any stage of pregnancy, including domperidone.[26]

Reflux in children

Domperidone has been found effective in the treatment of reflux in children.[27] However some specialists consider its risks prohibitory of the treatment of infantile reflux.[28]

Contraindications

Side effects

Side effects associated with domperidone include dry mouthabdominal crampsdiarrheanausearashitchinghives, and hyperprolactinemia (the symptoms of which may include breast enlargementgalactorrheabreast pain/tendernessgynecomastiahypogonadism, and menstrual irregularities).[25] Due to blockade of D2 receptors in the central nervous system, D2 receptor antagonists like metoclopramide can also produce a variety of additional side effects including drowsinessakathisiarestlessnessinsomnialassitudefatigueextrapyramidal symptomsdystoniaParkinsonian symptomstardive dyskinesia, and depression.[1][7] However, this is not the case with domperidone, because, unlike other D2 receptor antagonists, it minimally crosses the blood-brain-barrier, and for this reason, is rarely associated with such side effects.[1][7]

Excess prolactin levels

Due to D2 receptor blockade, domperidone causes hyperprolactinemia.[30] Hyperprolactinemia can suppress the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus, in turn suppressing the secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) and resulting in hypogonadism (low sex hormone (e.g., testosteroneestradiol) levels).[31] As such, male patients may experience low libidoerectile dysfunction, and impaired spermatogenesis.[31] Also in accordance with hyperprolactinemia, 10–15% of female patients have been reported to experience mammoplasia (breast enlargement), mastodynia (breast pain/tenderness), galactorrhea (inappropriate or excessive milk production/secretion), and amenorrhea (cessation of menstrual cycles) with domperidone treatment.[30] Gynecomastia has been reported in males treated with domperidone,[32] and galactorrhea could occur in males as well.[31]

Rare reactions

Cardiac reactions

Domperidone use is associated with an increased risk of sudden cardiac death (by 70%)[33] most likely through its prolonging effect of the cardiac QT interval and ventricular arrhythmias.[34][35] The cause is thought to be blockade of hERG voltage-gated potassium channels.[36][37] The risks are dose-dependent, and appear to be greatest with high/very high doses via intravenous administration and in the elderly, as well as with drugs that interact with domperidone and increase its circulating concentrations (namely CYP3A4 inhibitors).[38][39] Conflicting reports exist, however.[40] In neonates and infants, QT prolongation is controversial and uncertain.[41][42]

UK drug regulatory authorities (MHRA) have issued the following restriction on domperidone in 2014 due to increased risk of adverse cardiac effects:

Domperidone (Motilium) is associated with a small increased risk of serious cardiac side effects. Its use is now restricted to the relief of nausea and vomiting and the dosage and duration of use have been reduced. It should no longer be used for the treatment of bloating and heartburn. Domperidone is now contraindicated in those with underlying cardiac conditions and other risk factors. Patients with these conditions and patients receiving long-term treatment with domperidone should be reassessed at a routine appointment, in light of the new advice.

However, a 2015 Australian review concluded the following:[39]

Based on the results of the two TQT (the regulatory agency gold standard for assessment of QT prolongation) domperidone does not appear to be strongly associated with QT prolongation at oral doses of 20 mg QID in healthy volunteers. Further, there are limited case reports supporting an association with cardiac dysfunction, and the frequently cited case-control studies have significant flaws. While there remains an ill-defined risk at higher systemic concentrations, especially in patients with a higher baseline risk of QT prolongation, our review does not support the view that domperidone presents intolerable risk.

Possible central toxicity in infants

In Britain a legal case involved the death of two children of a mother whose three children had all had hypernatraemia. She was charged with poisoning the children with salt. One of the children, who was born at 28 weeks gestation with respiratory complications and had a fundoplication for gastroesophageal reflux and failure to thrive was prescribed domperidone. An advocate for the mother suggested the child may have suffered neuroleptic malignant syndrome as a side effect of domperidone due to the drug crossing the child’s immature blood-brain-barrier.[43]

Interactions

In healthy volunteers, ketoconazole increased the Cmax and AUC concentrations of domperidone by 3- to 10-fold.[44] This was accompanied by a QT interval prolongation of about 10–20 milliseconds when domperidone 10 mg four times daily and ketoconazole 200 mg twice daily were administered, whereas domperidone by itself at the dosage assessed produced no such effect.[44] As such, domperidone with ketoconazole or other CYP3A4 inhibitors is a potentially dangerous combination.[44]

Pharmacology

Pharmacodynamics

Domperidone is a peripherally selective dopamine D2 and D3 receptor antagonist.[7] It has no clinically significant interaction with the D1 receptor, unlike metoclopramide.[7] The medication provides relief from nausea by blocking D receptors.[10] It blocks dopamine receptors in the anterior pituitary gland increasing release of prolactin which in turn increases lactation.[45][46] Domperidone may be more useful in some patients and cause harm in others by way of the genetics of the person, such as polymorphisms in the drug transporter gene ABCB1 (which encodes P-glycoprotein), the voltage-gated potassium channel KCNH2 gene (hERG/Kv11.1), and the α1D—adrenoceptor ADRA1D gene.[47]

Effects on prolactin levels

A single 20 mg oral dose of domperidone has been found to increase mean serum prolactin levels (measured 90 minutes post-administration) in non-lactating women from 8.1 ng/mL to 110.9 ng/mL (a 13.7-fold increase).[7][48][49][50] This was similar to the increase in prolactin levels produced by a single 20 mg oral dose of metoclopramide (7.4 ng/mL to 124.1 ng/mL; 16.7-fold increase).[49][50] After two weeks of chronic administration (30 mg/day in both cases), the increase in prolactin levels produced by domperidone was reduced (53.2 ng/mL; 6.6-fold above baseline), but the increase in prolactin levels produced by metoclopramide, conversely, was heightened (179.6 ng/mL; 24.3-fold above baseline).[7][50] This indicates that acute and chronic administration of both domperidone and metoclopramide is effective in increasing prolactin levels, but that there are differential effects on the secretion of prolactin with chronic treatment.[49][50] The mechanism of the difference is unknown.[50] The increase in prolactin levels observed with the two drugs was, as expected, much greater in women than in men.[49][50] This appears to be due to the higher estrogen levels in women, as estrogen stimulates prolactin secretion.[51]

For comparison, normal prolactin levels in women are less than 20 ng/mL, prolactin levels peak at 100 to 300 ng/mL at parturition in pregnant women, and in lactating women, prolactin levels have been found to be 90 ng/mL at 10 days postpartum and 44 ng/mL at 180 days postpartum.[52][53]

Pharmacokinetics

With oral administration, domperidone is extensively metabolized in the liver (almost exclusively by CYP3A4/5, though minor contributions by CYP1A2CYP2D6, and CYP2C8 have also been reported)[54] and in the intestines.[5] Due to the marked first-pass effect via this route, the oral bioavailability of domperidone is low (13–17%);[1] conversely, its bioavailability is high via intramuscular injection (90%).[1] The terminal half-life of domperidone is 7.5 hours in healthy individuals, but can be prolonged to 20 hours in people with severe renal dysfunction.[1] All of the metabolites of domperidone are inactive as D2 receptor ligands.[1][5] The drug is a substrate for the P-glycoprotein (ABCB1) transporter, and animal studies suggest that this is the reason for the low central nervous system penetration of domperidone.[55]

Chemistry

Domperidone is a benzimidazole derivative and is structurally related to butyrophenone neuroleptics like haloperidol.[56][57]

History

  • 1974 – Domperidone synthesized at Janssen Pharmaceutica[58] following the research on antipsychotic drugs.[59] Janssen pharmacologists discovered that some of antipsychotic drugs had a significant effect on dopamine receptors in the central chemoreceptor trigger zone that regulated vomiting and started searching for a dopamine antagonist that would not pass the blood–brain barrier, thereby being free of the extrapyramidal side effects that were associated with drugs of this type.[59] This led to the discovery of domperidone as a strong anti-emetic with minimal central effects.[59][60]
  • 1978 – On 3 January 1978 Domperidone was patented in the United States under patent US4066772 A. The application has been filed on 17 May 1976. Jan Vandenberk, Ludo E. J. Kennis, Marcel J. M. C. Van der Aa and others has been cited as the inventors.
  • 1979 – Domperidone marketed under trade name “Motilium” in Switzerland and (Western) Germany.[61]
  • 1999 – Domperidone was introduced in the forms of orally disintegrating tablets (based on Zydis technology).[62]
  • Janssen Pharmaceutical has brought domperidone before the United States Federal Drug Administration (FDA) several times, including in the 1990s.
  • 2014 – In April 2014 Co-ordination Group for Mutual Recognition and Decentralised Procedures – Human (CMDh) published official press-release suggesting to restrict the use of domperidone-containing medicines. It also approved earlier published suggestions by Pharmacovigilance Risk Assessment Committee (PRAC) to use domperidone only for curing nausea and vomiting and reduce maximum daily dosage to 10 mg.[9]

Society and culture

Generic names

Domperidone is the generic name of the drug and its INNUSANBAN, and JAN.[63][6][64]

Regulatory approval

It was reported in 2007 that domperidone is available in 58 countries, including Canada,[65] but the uses or indications of domperidone vary between nations. In Italy it is used in the treatment of gastroesophageal reflux disease and in Canada, the drug is indicated in upper gastrointestinal motility disorders and to prevent gastrointestinal symptoms associated with the use of dopamine agonist antiparkinsonian agents.[66] In the United Kingdom, domperidone is only indicated for the treatment of nausea and vomiting and the treatment duration is usually limited to 1 week.

In the United States, domperidone is not currently a legally marketed human drug and it is not approved for sale in the U.S. On 7 June 2004, FDA issued a public warning that distributing any domperidone-containing products is illegal.[67]

It is available over-the-counter to treat gastroesophageal reflux and functional dyspepsia in many countries, such as Ireland, the Netherlands, Italy, South Africa, Mexico, Chile, and China.[68]

Domperidone is not generally approved for use in the United States. There is an exception for use in people with treatment-refractory gastrointestinal symptoms under an FDA Investigational New Drug application.[1]

Formulations

showFormulations

Research

Domperidone has been studied as a potential hormonal contraceptive to prevent pregnancy in women.[72]

References

  1. Jump up to:a b c d e f g h i j k l m n o p q r s Reddymasu, Savio C.; Soykan, Irfan; McCallum, Richard W. (2007). “Domperidone: Review of Pharmacology and Clinical Applications in Gastroenterology”. The American Journal of Gastroenterology102 (9): 2036–2045. ISSN 0002-9270PMID 17488253.
  2. ^ “БРЮЛІУМ ЛІНГВАТАБС” [BRULIUM LINGUATABS]. Нормативно-директивні документи МОЗ України (in Ukrainian). 18 March 2014. Retrieved 29 May 2015.
  3. ^ “Domperidone”. Archived from the original on 22 May 2013. Retrieved 30 June 2013.
  4. Jump up to:a b Suzanne Rose (October 2004). Gastrointestinal and Hepatobiliary Pathophysiology. Hayes Barton Press. pp. 523–. ISBN 978-1-59377-181-2.
  5. Jump up to:a b c d Simard, C.; Michaud, V.; Gibbs, B.; Massé, R.; Lessard, É; Turgeon, J. (2008). “Identification of the cytochrome P450 enzymes involved in the metabolism of domperidone”. Xenobiotica34 (11–12): 1013–1023. doi:10.1080/00498250400015301ISSN 0049-8254PMID 15801545S2CID 27426219.
  6. Jump up to:a b Index Nominum 2000: International Drug Directory. Taylor & Francis. January 2000. pp. 366–. ISBN 978-3-88763-075-1.
  7. Jump up to:a b c d e f g h Barone JA (1999). “Domperidone: a peripherally acting dopamine2-receptor antagonist”. The Annals of Pharmacotherapy33 (4): 429–40. doi:10.1345/aph.18003PMID 10332535S2CID 39279569.
  8. ^ “MOTILIUM INSTANTS PL 13249/0028” (PDF). Medicines and Healthcare products Regulatory Agency. 23 February 2010. Archived from the original (PDF) on 31 October 2014. Retrieved 2014-10-31.
  9. Jump up to:a b “CMDh confirms recommendations on restricting use of domperidone-containing medicines: European Commission to take final legal decision”European Medicines Agency. 25 April 2014. Archived from the original on 30 January 2016. Retrieved 2014-10-31.
  10. Jump up to:a b Reddymasu SC, Soykan I, McCallum RW. (2007). “Domperidone: review of pharmacology and clinical applications in gastroenterology”. Am J Gastroenterol102 (9): 2036–45. PMID 17488253.
  11. ^ Worthington I, Pringsheim T, Gawel MJ, Gladstone J, Cooper P, Dilli E, Aube M, Leroux E, Becker WJ (September 2013). “Canadian Headache Society Guideline: acute drug therapy for migraine headache”The Canadian Journal of Neurological Sciences40(5 Suppl 3): S1–S80. doi:10.1017/S0317167100118943PMID 23968886.
  12. ^ Stevens JE, Jones KL, Rayner CK, Horowitz M (June 2013). “Pathophysiology and pharmacotherapy of gastroparesis: current and future perspectives”. Expert Opinion on Pharmacotherapy14(9): 1171–86. doi:10.1517/14656566.2013.795948PMID 23663133S2CID 23526883.
  13. ^ Silvers D, Kipnes M, Broadstone V, Patterson D, Quigley EM, McCallum R, Leidy NK, Farup C, Liu Y, Joslyn A (1998). “Domperidone in the management of symptoms of diabetic gastroparesis: efficacy, tolerability, and quality-of-life outcomes in a multicenter controlled trial. DOM-USA-5 Study Group”. Clinical Therapeutics20 (3): 438–53. doi:10.1016/S0149-2918(98)80054-4PMID 9663360.
  14. ^ Janssen P, Harris MS, Jones M, Masaoka T, Farré R, Törnblom H, Van Oudenhove L, Simrén M, Tack J (September 2013). “The relation between symptom improvement and gastric emptying in the treatment of diabetic and idiopathic gastroparesis”. The American Journal of Gastroenterology108 (9): 1382–91. doi:10.1038/ajg.2013.118PMID 24005344S2CID 32835351.
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  18. ^ Grzeskowiak LE, Smithers LG, Amir LH, Grivell RM (October 2018). “Domperidone for increasing breast milk volume in mothers expressing breast milk for their preterm infants: a systematic review and meta-analysis”BJOG125 (11): 1371–1378. doi:10.1111/1471-0528.15177hdl:2440/114203PMID 29469929.
  19. ^ Grzeskowiak LE, Lim SW, Thomas AE, Ritchie U, Gordon AL (February 2013). “Audit of domperidone use as a galactogogue at an Australian tertiary teaching hospital”. Journal of Human Lactation29 (1): 32–7. doi:10.1177/0890334412459804hdl:2440/94368PMID 23015150S2CID 26535783.
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  41. ^ Djeddi D, Kongolo G, Lefaix C, Mounard J, Léké A (November 2008). “Effect of domperidone on QT interval in neonates”. The Journal of Pediatrics153 (5): 663–6. doi:10.1016/j.jpeds.2008.05.013PMID 18589449.
  42. ^ Günlemez A, Babaoğlu A, Arisoy AE, Türker G, Gökalp AS (January 2010). “Effect of domperidone on the QTc interval in premature infants”Journal of Perinatology30 (1): 50–3. doi:10.1038/jp.2009.96PMC 2834362PMID 19626027.
  43. ^ Coulthard MG, Haycock GB (January 2003). “Distinguishing between salt poisoning and hypernatraemic dehydration in children”BMJ (Clinical Research Ed.)326 (7381): 157–60. doi:10.1136/bmj.326.7381.157PMC 1128889PMID 12531853.
  44. Jump up to:a b c Jeffrey K. Aronson (27 November 2009). Meyler’s Side Effects of Antimicrobial Drugs. Elsevier. pp. 2244–. ISBN 978-0-08-093293-4.
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  46. ^ Sakamoto Y, Kato S, Sekino Y, Sakai E, Uchiyama T, Iida H, Hosono K, Endo H, Fujita K, Koide T, Takahashi H, Yoneda M, Tokoro C, Goto A, Abe Y, Kobayashi N, Kubota K, Maeda S, Nakajima A, Inamori M (2011). “Effects of domperidone on gastric emptying: a crossover study using a continuous real-time 13C breath test (BreathID system)”. Hepato-gastroenterology58 (106): 637–41. PMID 21661445.
  47. ^ Parkman HP, Jacobs MR, Mishra A, Hurdle JA, Sachdeva P, Gaughan JP, Krynetskiy E (January 2011). “Domperidone treatment for gastroparesis: demographic and pharmacogenetic characterization of clinical efficacy and side-effects”. Digestive Diseases and Sciences56 (1): 115–24. doi:10.1007/s10620-010-1472-2PMID 21063774S2CID 39632855.
  48. ^ Gabay MP (2002). “Galactogogues: medications that induce lactation”. J Hum Lact18 (3): 274–9. doi:10.1177/089033440201800311PMID 12192964S2CID 29261467.
  49. Jump up to:a b c d Hofmeyr GJ, Van Iddekinge B, Blott JA (1985). “Domperidone: secretion in breast milk and effect on puerperal prolactin levels”. Br J Obstet Gynaecol92 (2): 141–4. doi:10.1111/j.1471-0528.1985.tb01065.xPMID 3882143S2CID 25489895.
  50. Jump up to:a b c d e f Brouwers JR, Assies J, Wiersinga WM, Huizing G, Tytgat GN (1980). “Plasma prolactin levels after acute and subchronic oral administration of domperidone and of metoclopramide: a cross-over study in healthy volunteers”. Clin. Endocrinol12 (5): 435–40. doi:10.1111/j.1365-2265.1980.tb02733.xPMID 7428183S2CID 27266775.
  51. ^ Fujino T, Kato H, Yamashita S, Aramaki S, Morioka H, Koresawa M, Miyauchi F, Toyoshima H, Torigoe T (1980). “Effects of domperidone on serum prolactin levels in human beings”Endocrinol. Jpn27 (4): 521–5. doi:10.1507/endocrj1954.27.521PMID 7460861.
  52. ^ Jan Riordan (January 2005). Breastfeeding and Human Lactation. Jones & Bartlett Learning. pp. 76–. ISBN 978-0-7637-4585-1.
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  56. ^ Hospital Formulary. HFM Publishing Corporation. 1991. p. 171. Domperidone, a benzimidazole derivative, is structurally related to the butyrophenone tranquilizers (eg, haloperidol (Haldol, Halperon]).
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  58. ^ Wan EW, Davey K, Page-Sharp M, Hartmann PE, Simmer K, Ilett KF (27 May 2008). “Dose-effect study of domperidone as a galactagogue in preterm mothers with insufficient milk supply, and its transfer into milk”British Journal of Clinical Pharmacology66(2): 283–289. doi:10.1111/j.1365-2125.2008.03207.xPMC 2492930PMID 18507654.
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Clinical data
Trade namesMotilium, many others
AHFS/Drugs.comMicromedex Detailed Consumer Information
Pregnancy
category
AU: B2
Routes of
administration
By mouthintramuscularintravenous (d/c’d), rectal[1]
Drug classD2 receptor antagonistProlactin releaser
ATC codeA03FA03 (WHOQP51AX24 (WHO)
Legal status
Legal statusUK: POM (Prescription only)US: Not approved for use or salePrescription medicine (Rx only):Pakistan, India, Australia, Canada, Israel, Belgium, France, Netherlands; over-the-counter: Egypt, Ireland, Italy, Japan, South Africa, Switzerland, Kuwait, China, Russia, Slovakia, Ukraine[2] Mexico, Thailand, Malta, South Korea, and Romania[3]
Pharmacokinetic data
BioavailabilityOral: 13–17%[1][4]
Intramuscular: 90%[1]
Protein binding~92%[1]
MetabolismHepatic (CYP3A4/5) and intestinal (first-pass)[1][5]
MetabolitesAll inactive[1][5]
Elimination half-life7.5 hours[1][4]
ExcretionFeces: 66%[1]
Urine: 32%[1]
Breast milk: small quantities[1]
Identifiers
showIUPAC name
CAS Number57808-66-9 
PubChem CID3151
IUPHAR/BPS965
DrugBankDB01184 
ChemSpider3039 
UNII5587267Z69
KEGGD01745 
ChEBICHEBI:31515 
ChEMBLChEMBL219916 
CompTox Dashboard (EPA)DTXSID1045116 
ECHA InfoCard100.055.408 
Chemical and physical data
FormulaC22H24ClN5O2
Molar mass425.92 g·mol−1
3D model (JSmol)Interactive image
Melting point242.5 °C (468.5 °F)
showSMILES
showInChI
  (verify)

//////////////DOMPERIDONE,  Antiemetic, Dopamine Receptor Antagonist, домперидон , دومبيريدون , 多潘立酮

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Amisulpride, アミスルプリド ,


71675-85-9.png

ChemSpider 2D Image | Amisulpride | C17H27N3O4S

Amisulpride.svg

Amisulpride

FDA 2020, Barhemsys APPROVED, 2020/2/27

Name
Amisulpride (INN);
Deniban (TN);
Solian (TN)
アミスルプリド;
Formula
C17H27N3O4S
CAS
71675-85-9
Mol weight
369.479

Antipsychotic, Dopamine receptor antagonist, Neuropsychiatric agent

amisulpride(标准品)

275-831-7 [EINECS]
Synthesis ReferenceUS4401822
4-Amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-(ethylsulfonyl)-2-methoxybenzamide
Amisulpride
CAS Registry Number: 71675-85-9
CAS Name: 4-Amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-(ethylsulfonyl)-2-methoxybenzamide
Additional Names: 4-amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-(ethylsulfonyl)-o-anisamide; aminosultopride
Manufacturers’ Codes: DAN-2163
Trademarks: Deniban (Synthelabo); Socian (Synthelabo); Solian (Synthelabo); Sulamid (Baldacci)
Molecular Formula: C17H27N3O4S
Molecular Weight: 369.48
Percent Composition: C 55.26%, H 7.37%, N 11.37%, O 17.32%, S 8.68%
Literature References: Dopamine receptor antagonist. Prepn: M. Thominet et al., BE 872585eidem, US 4401822 (1979, 1983 both to Soc. d’Etudes Sci. Ind. de l’Ile-de-France).
Crystal structure: H. L. DeWinter et al., Acta Crystallogr. C46, 313 (1990). Psychopharmacology: G. Perrault et al., J. Pharmacol. Exp. Ther. 280, 73 (1997). HPLC determn in plasma and urine: B. Malavasi et al., J. Chromatogr. B 676, 107 (1996). Series of articles on pharmacology and clinical efficacy in schizophrenia: Int. Clin. Psychopharmacol. 12, Suppl. 2, S11-S36 (1997).
Properties: Crystals from acetone, mp 126-127°. LD50 in male mice (mg/kg): 56-60 i.v.; 175-180 i.p.; 224-250 s.c.; 1024-1054 orally (Thominet).
Melting point: mp 126-127°
Toxicity data: LD50 in male mice (mg/kg): 56-60 i.v.; 175-180 i.p.; 224-250 s.c.; 1024-1054 orally (Thominet)
Therap-Cat: Antipsychotic.
Keywords: Antipsychotic; Benzamides; Dopamine Receptor Antagonist.
Amisulpride (trade name Solian) is an antipsychotic drug sold by Sanofi-Aventis.  but is approved for use in Europe and Australia for the treatment of psychoses and schizophrenia. Additionally, it is approved in Italy for the treatment of dysthymia (under the brand name Deniban). Amisulpride is a selective dopamine antagonist.

Amisulpride is an antiemetic and antipsychotic medication used at lower doses intravenously to prevent and treat postoperative nausea and vomiting; and at higher doses orally and intramuscularly to treat schizophrenia and acute psychotic episodes. It is sold under the brandnames Barhemsys[6] (as an antiemetic) and Solian, Socian, Deniban and others (as an antipsychotic).[2] It is also used to treat dysthymia.[7]

It is usually classed with the atypical antipsychotics. Chemically it is a benzamide and like other benzamide antipsychotics, such as sulpiride, it is associated with a high risk of elevating blood levels of the lactation hormone, prolactin (thereby potentially causing the absence of the menstrual cycle, breast enlargement, even in males, breast milk secretion not related to breastfeeding, impaired fertility, impotence, breast pain, etc.), and a low risk, relative to the typical antipsychotics, of causing movement disorders.[8][9][10] It has also been found to be modestly more effective in treating schizophrenia than the typical antipsychotics.[9]

Amisulpride is approved for use in the United States in adults for the prevention of postoperative nausea and vomiting (PONV), either alone or in combination with an antiemetic of a different class; and to treat PONV in those who have received antiemetic prophylaxis with an agent of a different class or have not received prophylaxis.[6]

Amisulpride is believed to work by blocking, or antagonizing, the dopamine D2 receptor, reducing its signalling. The effectiveness of amisulpride in treating dysthymia and the negative symptoms of schizophrenia is believed to stem from its blockade of the presynapticdopamine D2 receptors. These presynaptic receptors regulate the release of dopamine into the synapse, so by blocking them amisulpride increases dopamine concentrations in the synapse. This increased dopamine concentration is theorized to act on dopamine D1 receptors to relieve depressive symptoms (in dysthymia) and the negative symptoms of schizophrenia.[7]

It was introduced by Sanofi-Aventis in the 1990s. Its patent expired by 2008, and generic formulations became available.[11] It is marketed in all English-speaking countries except for Canada and the United States.[10] A New York City based company, LB Pharmaceuticals, has announced the ongoing development of LB-102, also known as N-methyl amisulpride, an antipsychotic specifically targeting the United States.[12][13] A poster presentation at European Neuropsychopharmacology[14] seems to suggest that this version of amisulpride, known as LB-102 displays the same binding to D2, D3 and 5HT7 that amisulpride does.[15][16]

Medical uses

Schizophrenia

In a 2013 study in a comparison of 15 antipsychotic drugs in effectiveness in treating schizophrenic symptoms, amisulpride was ranked second and demonstrated high effectiveness. 11% more effective than olanzapine (3rd), 32-35% more effective than haloperidolquetiapine, and aripiprazole, and 25% less effective than clozapine (1st).[9] Although according to other studies it appears to have comparable efficacy to olanzapine in the treatment of schizophrenia.[17][18] Amisulpride augmentation, similarly to sulpirideaugmentation, has been considered a viable treatment option (although this is based on low-quality evidence) in clozapine-resistant cases of schizophrenia.[19][20] Another recent study concluded that amisulpride is an appropriate first-line treatment for the management of acute psychosis.[21]

Contraindications

Amisulpride’s use is contraindicated in the following disease states[2][22][8]

Neither is it recommended to use amisulpride in patients with hypersensitivities to amisulpride or the excipients found in its dosage form.[2]

Adverse effects

Very Common (≥10% incidence)[1]
  • Extrapyramidal side effects (EPS; including dystonia, tremor, akathisiaparkinsonism). Produces a moderate degree of EPS; more than aripiprazole (not significantly, however), clozapine, iloperidone (not significantly), olanzapine (not significantly), quetiapine (not significantly) and sertindole; less than chlorpromazine (not significantly), haloperidol, lurasidone (not significantly), paliperidone (not significantly), risperidone (not significantly), ziprasidone (not significantly) and zotepine (not significantly).[9]
Common (≥1%, <10% incidence)[1][2][23][22][8]
  • Hyperprolactinaemia (which can lead to galactorrhoea, breast enlargement and tenderness, sexual dysfunction, etc.)
  • Weight gain (produces less weight gain than chlorpromazine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, sertindole, zotepine and more (although not statistically significantly) weight gain than haloperidol, lurasidone, ziprasidone and approximately as much weight gain as aripiprazole and asenapine)[9]
  • Anticholinergic side effects (although it does not bind to the muscarinic acetylcholine receptors and hence these side effects are usually quite mild) such as
– constipation
– dry mouth
– disorder of accommodation
– Blurred vision
Rare (<1% incidence)[1][2][23][22][8]

Hyperprolactinaemia results from antagonism of the D2 receptors located on the lactotrophic cells found in the anterior pituitary gland. Amisulpride has a high propensity for elevating plasma prolactin levels as a result of its poor blood-brain barrier penetrability and hence the resulting greater ratio of peripheral D2 occupancy to central D2 occupancy. This means that to achieve the sufficient occupancy (~60–80%[24]) of the central D2 receptors in order to elicit its therapeutic effects a dose must be given that is enough to saturate peripheral D2receptors including those in the anterior pituitary.[25][26]

  • Somnolence. It produces minimal sedation due to its absence of cholinergic, histaminergic and alpha adrenergic receptor antagonism. It is one of the least sedating antipsychotics.[9]

Discontinuation

The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse.[27] Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite.[28] Other symptoms may include restlessness, increased sweating, and trouble sleeping.[28] Less commonly there may be a felling of the world spinning, numbness, or muscle pains.[28] Symptoms generally resolve after a short period of time.[28]

There is tentative evidence that discontinuation of antipsychotics can result in psychosis.[29] It may also result in reoccurrence of the condition that is being treated.[30] Rarely tardive dyskinesia can occur when the medication is stopped.[28]

Overdose

Torsades de pointes is common in overdose.[31][32] Amisulpride is moderately dangerous in overdose (with the TCAs being very dangerous and the SSRIs being modestly dangerous).[33][34]

Interactions

Amisulpride should not be used in conjunction with drugs that prolong the QT interval (such as citalopramvenlafaxinebupropionclozapinetricyclic antidepressantssertindoleziprasidone, etc.),[33] reduce heart rate and those that can induce hypokalaemia. Likewise it is imprudent to combine antipsychotics due to the additive risk for tardive dyskinesia and neuroleptic malignant syndrome.[33]

Pharmacology

Pharmacodynamics

Amisulpride and its relatives sulpiridelevosulpiride, and sultopride have been shown to bind to the high-affinity GHB receptor at concentrations that are therapeutically relevant (IC50 = 50 nM for amisulpride).[37]Amisulpride functions primarily as a dopamine D2 and D3 receptor antagonist. It has high affinity for these receptors with dissociation constantsof 3.0 and 3.5 nM, respectively.[36] Although standard doses used to treat psychosis inhibit dopaminergic neurotransmission, low doses preferentially block inhibitory presynaptic autoreceptors. This results in a facilitation of dopamine activity, and for this reason, low-dose amisulpride has also been used to treat dysthymia.[2]

Amisulpride, sultopride and sulpiride respectively present decreasing in vitro affinities for the D2 receptor (IC50 = 27, 120 and 181 nM) and the D3 receptor (IC50 = 3.6, 4.8 and 17.5 nM).[39]

Though it was long widely assumed that dopaminergic modulation is solely responsible for the respective antidepressant and antipsychoticproperties of amisulpride, it was subsequently found that the drug also acts as a potent antagonist of the serotonin 5-HT7 receptor (Ki = 11.5 nM).[36] Several of the other atypical antipsychotics such as risperidone and ziprasidone are potent antagonists at the 5-HT7 receptor as well, and selective antagonists of the receptor show antidepressant properties themselves. To characterize the role of the 5-HT7 receptor in the antidepressant effects of amisulpride, a study prepared 5-HT7 receptor knockout mice.[36] The study found that in two widely used rodent models of depression, the tail suspension test, and the forced swim test, those mice did not exhibit an antidepressant response upon treatment with amisulpride.[36] These results suggest that 5-HT7 receptor antagonism mediates the antidepressant effects of amisulpride.[36]

Amisulpride also appears to bind with high affinity to the serotonin 5-HT2B receptor (Ki = 13 nM), where it acts as an antagonist.[36] The clinical implications of this, if any, are unclear.[36] In any case, there is no evidence that this action mediates any of the therapeutic effects of amisulpride.[36]

Society and culture

Brand names

Brand names include: Amazeo, Amipride (AU), Amival, Solian (AUIERUUKZA), Soltus, Sulpitac (IN), Sulprix (AU), Midora (RO) and Socian (BR).[40][41]

Availability

Amisulpride was not approved by the Food and Drug Administration for use in the United States until February 2020, but it is used in Europe,[41]Israel, Mexico, India, New Zealand and Australia[2] to treat psychosis and schizophrenia.[42][43]

Amisulpride was approved for use in the United States in February 2020.[44][6]

CLIP

Dopamine receptor antagonist. Prepn: M. Thominet et al., BE 872585; eidem, U.S. Patent 4,401,822 (1979, 1983 both to Soc. d’Etudes Sci. Ind. de l’Ile-de-France).

CLIP

4-Amino-N-((1-ethyl-2-pyrrolidinyl)methyl)-5-(ethylsulfonyl)-o-anisamide, could be produced through many synthetic methods.

Following is one of the synthesis routes:
Firstly, the acetylation of 5-aminosalicylic acid (I) with acetic anhydride in hot acetic acid affords 5-acetaminosalicylic acid (II), which is methylated with dimethyl sulfate and K2CO3 in refluxing acetone producing methyl 2-methoxy-5-acetaminobenzoate (III). Secondly, nitration of (III) with HNOin acetic acid affords methyl 2-methoxy-4-nitro-5-acetaminobenzoate (IV), which is deacetylated with H2SO4 in refluxing methanol to give methyl 2-methoxy-4-nitro-5-aminobenzoate (V). Next, the diazotation of (V) with NaNO2-HCl, followed by reaction with sodium ethylmercaptide, oxidation with H2O2 and hydrolysis with NaOH in ethanol yields 2-methoxy-4-nitro-5-(ethylsulfonyl)benzoic acid (VI), which is condensed with N-ethyl-2-aminomethylpyrrolidine (VII) in the presence of ethyl chloroformate and triethylamine in dioxane affording 2-methoxy-4-nitro-N-[(1-ethyl-2-pyrrolidinyl) methyl]-5-(ethylsulfonyl)benzamide (VIII). At last, this compound is reduced with H2 over Raney-Ni in ethanol.

Production Route of Amisulpride

CLIP

BE 0872585; ES 476755; FR 2415099; GB 2083458; JP 54145658; US 4294828; US 4401822

Alkylation of 2-methoxy-4-amino-5-mercaptobenzoic acid (X) with diethyl sulfate acid Na2CO3 gives 2-methoxy-4-amino-5-ethylthiobenzoic acid (XI), which is oxidized with H2O2 in acetic acid yielding 2-methoxy-4-amino-5-(ethylsulfonyl)benzoic acid (XII). Finally, this compound is condensed with (VII) by means of ethyl chloroformate.

CLIP

FR 2460930

Acetylation of 5-aminosalicylic acid (I) with acetic anhydride in hot acetic acid gives 5-acetaminosalicylic acid (II), which is methylated with dimethyl sulfate and K2CO3 in refluxing acetone yielding methyl 2-methoxy-5-acetaminobenzoate (III). Nitration of (III) with HNO3 in acetic acid affords methyl 2-methoxy-4-nitro-5-acetaminobenzoate (IV), which is deacetylated with H2SO4 in refluxing methanol to give methyl 2-methoxy-4-nitro-5-aminobenzoate (V). The diazotation of (V) with NaNO2-HCl, followed by reaction with sodium ethylmercaptide, oxidation with H2O2 and hydrolysis with NaOH in ethanol yields 2-methoxy-4-nitro-5-(ethylsulfonyl)benzoic acid (VI), which is condensed with N-ethyl-2-aminomethylpyrrolidine (VII) by means of ethyl chloroformate and triethylamine in dioxane affording 2-methoxy-4-nitro-N-[(1-ethyl-2-pyrrolidinyl) methyl]-5-(ethylsulfonyl)benzamide (VIII). Finally, this compound is reduced with H2 over Raney-Ni in ethanol.

CLIP

Treatment of thiourea (I) with iodomethane provided S-methylthiouronium iodide (II). This was further condensed with N-methylpiperazine (III) to afford the intermediate piperazine-1-carboxamidine (IV)

CLIP

Regioselective lithiation of 1,2,4-trichlorobenzene (V) with n-BuLi at -60 C, followed by quenching of the resultant organolithium compound (VI) with N,N-dimethylformamide yielded 2,3,5-trichlorobenzaldehyde (VII) (1), which was then reduced with NaBH4 to provide alcohol (VIII). Bromination of (VIII) using PBr3 afforded compound (IX), whose bromide atom was displaced with KCN to give the trichlorophenylacetonitrile (X). Claisen condensation of (X) with ethyl formate in the presence of NaOEt furnished the oxo nitrile sodium enolate (XI), which was subsequently O-alkylated with iodomethane yielding the methoxy acrylonitrile (XII). Finally, cyclization of (XII) with the piperazine-1-carboxamidine (IV) in EtOH gave rise to the target pyrimidine derivative

PATENT

https://patents.google.com/patent/US20130096319A1/en

Amisulpride is represented by the formula (I) as given below.

Figure US20130096319A1-20130418-C00001

The product patent U.S. Pat. No. 4,401,822 describes preparation of amisulpride as shown in scheme (I)

Figure US20130096319A1-20130418-C00002

The synthesis of amisulpride involves oxidation of 2-methoxy-4-amino-5-ethyl-thio benzoic acid (III) using acetic acid and hydrogen peroxide at 40-45° C. for few hours to obtain 2-methoxy-4-amino-5-ethyl-sulfonyl benzoic acid (IV). In our attempt to repeat this reaction, we found that almost 22 hours were required for completion and the purity of compound (IV) was 87.6%.

    • [0006]
      Thus, the product patent method suffers from the disadvantages such as high reaction time, low yield and low purity.
    • [0007]
      Liu Lie et al, Jingxi Huagong Zhongjianti 2008, 38 (3), 29-32 describes the process for the preparation of 2-methoxy-4-amino-5-ethyl-sulfonyl benzoic acid (IV) as shown in scheme (II).
    • Figure US20130096319A1-20130418-C00003
    • [0008]
      4-amino salicylic acid (VI) is treated with dimethyl sulphate in the presence of potassium hydroxide and acetone to give 4-amino-2-methoxy-methyl benzoate in 4 hours, which is further treated with potassium thiocynate to give compound of formula (VIII). 4-Amino-2-,methoxy-5-thiocyanatobenzoate (VIII) is treated with bromoethane to give 4-amino-5-ethylthio-2-methoxy benzoic acid (IX) which is further converted to 2-methoxy-4-amino-5-ethyl-sulfonyl benzoic acid (IV) via oxidation with hydrogen peroxide and acetic acid.
    • [0009]
      The yield of conversion of compound (VIII) to compound (IX) is 57% and the overall yield of compound (IV) from compound (VI) is 24% only. Thus, the above process suffers from the disadvantages such as low yield and in that it uses bromoethane which is skin and eye irritant and has carcinogenic effects.
    • [0010]
      Therefore, there is, an unfulfilled need to provide industrially feasible process for the preparation of 2-methoxy-4-amino-5-ethyl-sulfonyl benzoic acid (IV) and amisulpride (I) with higher purity and yield, since it is one of the key intermediates in the manufacture of amisulpride.

SUMMARY OF THE INVENTION

The present invention is related to a novel process for the preparation of amisulpride (I) that involves: (i) methylation of 4-amino-salicylic-acid (VI) with dimethyl sulphate and base, optionally in presence of TBAB to obtain 4-amino-2-methoxy methyl benzoate (VII) and (ii) oxidation of 4-amino-2-methoxy-5-ethyl thio benzoic acid (IX) or 4-amino-2-methoxy-5-ethyl thio methyl benzoate (X) with oxidizing agent in the presence of sodium tungstate or ammonium molybdate to give 2-methoxy-4-amino-5-ethyl-sulfonyl benzoic acid (IV) or 2-methoxy-4-amino-5-ethyl-sulfonyl methyl benzoate (XI) respectively.
    • Example 13

    • [0097]
      Preparation of crude amisulpride
    • [0098]
      To a stirring mixture of 4-amino-2-methoxy-5-ethyl sulphonyl benzoic acid (IV) and acetone (5.0 L) at 0-5° C., triethyl amine (0.405 Kg) was added and stirred followed by addition of ethyl chloroformate (0.368 Kg). N-ethyl-2-amino methyl pyrrolidine (0.627 Kg) was added to the reaction mass at 5-10° C. Temperature of reaction mass was raised to 25-30° C. and stirred for 120 min. To the same reaction mass triethyl amine (0.405 Kg) and ethyl chloroformate (0.368 Kg) was added with maintaining the temperature. Reaction mass was stirred for 120 min. After completion of reaction, water (4.0 L) was added. Reaction mass was filtered and washed with water (2.0 L). Filtrate was collected and water was added (9.0 L). pH of the reaction mass was adjusted to 10.8-11.2 by using 20% NaOH solution. Reaction mass was stirred for 240-300 min, filtered and washed with water. Solid was dried under vacuum
    • [0099]
      Yield : 70%
    • [0100]
      Purity: 98%

Example 14

  • [0101]
    Purification of amisulpride
  • [0102]
    Amisulpride (1 kg) was charged in acetone (6 liters) and the reaction mixture was heated till a clear solution was obtained. Slurry of activated carbon (0.1 kg in 1 liter) was added in acetone. The reaction mass was stirred at 50-55 ° C. for 60 minutes and filtered hot. The filtrate was concentrated and further heated to dissolve the solid. The reaction mass was cooled to 0-5° C., stirred and filtered. The precipitated solid was washed with acetone and dried.
  • [0103]
    Yield: 750 gm (75%)
  • [0104]
    HPLC purity: 99.8% (quantitative)
  • [0105]
    M.P.: 125° C.
  • [0106]
    DSC: shows endotherm at 133° C.
  • [0107]
    Particle size: d10=0.637, d50=6.0, d90=13.325 microns

CLIP

https://watermark.silverchair.com/bmw186.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAmEwggJdBgkqhkiG9w0BBwagggJOMIICSgIBADCCAkMGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM_rfBl_qrJE7Y7K67AgEQgIICFOQ9ug62uUxOD4oCuuUGlGD3N04qUgCHew1O5UIyknvohf-_QUaJclqSZM6k5UhPTLgjkYyVMVgS04HMcDKUVXr1cMUfV6cExwayFb8z3MQUF4Ny6s8hPuAMJO4XsTm4qh0nnEykHwgMonNWdDr32D4B7NuEVwGE_5Z-d1yQvAdkNeCmEbHIaue3OTiocWodCsAv8yUdnXf1AtreXJkvsiAQtk4oCddsM_a2njiXJAc-VcFgTImCvsaCY-_eWT91Dc3gb7fpEAJSPLl06xx30GziAvF_hl5P33TaMFmVm_p-0rJGWi-_x92Tlo1CkuR1N1oWlcnuBSPqKeX3tbMO3phnIYtbDPycftd6UKI2f9-zyMRHgSId4xJCpaxvy6fndrWZ1qrHTyQLt_XqncL7zD8aYHER67kV3g30ZgAtcivHoMSHj9h4wGD5WLZ5-M4cZ0dpUyKx3E2njYBEBe0LNQyqDmP8HKpM_RBN2C2nuD2h1fJkiwf2kLAdlBC6gOhjl60XqU_7ARJZf_86kR3OhUJ5f8Ey2R-k3zwDHEc3tU10AlEky9ne-UWVHGjOCd9L-SV-eXfjOnaERGw9EHahxajGBCRuqa07-BtbV0mr53AKyaS5YUTQ2EZ7P3WarhImsJpYiQxWAuSlYn2F11RTMu_KjP7-DMXbX6pcq20axI2NNwrBtfsDXFbQWZ8q9R0FYGsUS90

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External links

Amisulpride
Amisulpride.svg
Amisulpride-xtal-1990-ball-and-stick-model.png
Clinical data
Trade names Solian, Barhemsys, others
Other names APD421
AHFS/Drugs.com International Drug Names
License data
Pregnancy
category
  • AU: C
Routes of
administration
By mouthintravenous
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability 48%[3][2]
Protein binding 16%[2]
Metabolism Hepatic (minimal; most excreted unchanged)[2]
Elimination half-life 12 hours[3]
Excretion Renal[3] (23–46%),[4][5]Faecal[2]
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.068.916 Edit this at Wikidata
Chemical and physical data
Formula C17H27N3O4S
Molar mass 369.48 g/mol g·mol−1
3D model (JSmol)

  1. Rosenzweig P, Canal M, Patat A, Bergougnan L, Zieleniuk I, Bianchetti G: A review of the pharmacokinetics, tolerability and pharmacodynamics of amisulpride in healthy volunteers. Hum Psychopharmacol. 2002 Jan;17(1):1-13. [PubMed:12404702]
  2. Moller HJ: Amisulpride: limbic specificity and the mechanism of antipsychotic atypicality. Prog Neuropsychopharmacol Biol Psychiatry. 2003 Oct;27(7):1101-11. [PubMed:14642970]
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