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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 GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 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, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, 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 30 year tenure till date Dec 2017, 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 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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Doxylamine succinate

Doxylamine succinate

CAS NO. 562-10-7,

Sperber et al. Journal of the American Chemical Society, 1949 , vol. 71, p. 887,889


Application of Toluene in the Synthesis of Doxylamine Succinate KC. Chaluvaraju1*, MD. Karvekar2 and AR. Ramesha3 1Department of Pharmaceutical Chemistry, Govt. College of Pharmacy, Bengaluru, Karnataka, India. 2Department of Pharmaceutical Chemistry, Krupanidhi College of Pharmacy, Bengaluru, Karnataka, India. 3R&D, R L Fine Chemicals, Bengaluru, Karnataka, India.

ABSTRACT In the present study an efficient method for the synthesis of Doxylamine succinate in the presence of toluene is described. The yield and purity of the product prepared by this method has been found to be better in comparison to reported method. The structure of the synthesized compound was characterised by its melting point and spectral data’s (IR, I HNMR, 13CNMR and Mass spectra). The data obtained are in good agreement with the literature found for Doxylamine succinate.


1HNMR (CDC13) δ ppm: 8.5 (d, J = 2.4 Hz ,1H; Het-H) ,7.6-7.0 (m,8H; Ar-H+ Het-H), 3.5-3.3 (t, J = 6.6 Hz, 2H;-OCH2), 2.6-2.5 (t, J = 3.0 Hz, 2H; – CH2), 2.3-2.2 (s, 6H, -N(CH3)2).2.0-1.9 (s, 3H, -CH3).

I3CNMR (CDC13) δ ppm: 148.17, 145.55, 136.17, 127.84, 126.62, 126.21, 121.50, 120.77, 81.81, 61.11, 59.39, 45.91, 23.76.

MS (EI) m/z: 271 (M+ ), 257, 226, 182.


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nmr  predict of succinate

Doxylamine succinate salt NMR spectra analysis, Chemical CAS NO. 562-10-7 NMR spectral analysis, Doxylamine succinate salt H-NMR spectrum

Doxylamine succinate salt NMR spectra analysis, Chemical CAS NO. 562-10-7 NMR spectral analysis, Doxylamine succinate salt C-NMR spectrum

nmr predict of free base

CAS NO. 469-21-6, N,N-dimethyl-2-(1-phenyl-1-pyridin-2-ylethoxy)ethanamine H-NMR spectral analysis

N,N-dimethyl-2-(1-phenyl-1-pyridin-2-ylethoxy)ethanamine NMR spectra analysis, Chemical CAS NO. 469-21-6 NMR spectral analysis, N,N-dimethyl-2-(1-phenyl-1-pyridin-2-ylethoxy)ethanamine H-NMR spectrum

N,N-dimethyl-2-(1-phenyl-1-pyridin-2-ylethoxy)ethanamine NMR spectra analysis, Chemical CAS NO. 469-21-6 NMR spectral analysis, N,N-dimethyl-2-(1-phenyl-1-pyridin-2-ylethoxy)ethanamine C-NMR spectrum

Doxylamine succinate following structural formula:

Figure CN102108059BD00031

CAS Number: 562-10-7

Formula = C21H28N2O5

Molecular weight: 388.46


 The present invention aims to provide a class of antihistamines ethanol as doxylamine succinate, the technical problem to be solved is the selection of a new simple synthetic methods.

The synthesis of doxylamine succinate process route is:

Figure CN102108059BD00041

 The synthesis of 2-acetyl-pyridine as starting materials, including synthetic and doxylamine salt-forming reaction and the separation and purification process of each unit, wherein the first synthetic doxylamine by The reaction of 2-acetyl pyridine Grignard reagent with bromobenzene and magnesium to produce 2-pyridyl generated methylcarbinol, then 2-pyridyl-methyl-phenyl methanol with sodium amide and sequentially generates 2-dimethylamino ethyl chloride reaction Doxylamine, most 后多西拉敏 a salt with succinic acid to give the title product doxylamine succinate.

the synthesis of doxylamine

150ml three-necked flask of xylene 40ml, weighed 2. 34g (0. 06mol) was added sodium amide three-neck flask, weighed 10g (0.05mol) 2- pyridyl methylcarbinol dissolved in 20ml of xylene was slowly added dropwise, followed by stirring.After the addition was complete, the oil bath was heated 150 ° C, maintained under reflux of xylene, the reaction was refluxed for 5 hours. Color from pale yellow reaction solution gradually turned dark brown, solid gradually dissolved.

 The dried mixture of 2-dimethylamino ethyl chloride was added 20ml of xylene dropping funnel was slowly added dropwise to the three-necked flask. After the addition was complete, maintaining at reflux for 20 hours. TLC monitoring of the reaction process, the reactants and products change (V petroleum ether: V ethyl acetate = 5: 1).

 After stopping the reaction, the oil bath was removed, and the reaction solution was cooled to room temperature, with ice-bath, was slowly added dropwise to the reaction solution 50ml of ice water, stirred for half an hour. The reaction solution was separated, the organic phase was retained and the aqueous phase was extracted with xylene (3 * 40ml), the combined organic

Phase. Drying, filtration, rotary evaporation to remove xylene.

The obtained crude product was subjected to silica gel mixed with the sample, the liquid sample with the silica mass ratio of 1: 2, dissolved in ethyl acetate, and stirred for half an hour, the solvent was removed by rotary evaporation. The mixed sample was subjected to column chromatography on silica gel, eluting with a mixed solvent (V petroleum ether: V ethyl acetate = 2: 1) petroleum ether and ethyl acetate eluent until the 2-pyridyl-methyl-phenyl The complete collection of components of methanol to stop the elution. The eluent was collected and the solvent was removed by rotary evaporation, after recycling the recovered 2-pyridyl-methyl-phenyl methanol and dried in vacuo.

The chromatography column of silica gel and the eluent was poured into the remaining single-necked flask, and the crude product was added mass of diethylamine, stirred for half an hour, filtration, and the solvent was removed by rotary evaporation and the liquid diethyl amine, to give doxylamine 7. 3g, 54% yield. Gas content was 99%. (Column chamber temperature 250 ° C, detection temperature 300 ° C, vaporization temperature of 300 ° C).

1HNMr (CDCI3), δ: 8 · 51 (1Η, m), 7 · 60-7 61 (2Η, m), 7 · 40 (2Η, m), 7 · 27 (2Η, m),. 7. 18 (1Η, m), 7. 09 (1H, m), 3. 41 (2H, m), 2. 59 (2H, m), 2. 27 (6H, s), 1. 98 (3H , s).

 3, doxylamine succinate synthesis of

 Doxylamine 1. 35g (0. 005mol) and succinic 0. 59g (0. 005mol) was added IOml single-necked flask, adding acetone 7ml, heating and stirring until dissolved, stirring was continued for half an hour, the heating was stopped. Cooled to room temperature and then placed in the refrigerator freezer -20 ° C for 24 hours. Filtration, the solid was placed in a vacuum desiccator the residual solvent was distilled off, and dried for 6 hours. The crude product was dissolved by heating continued recrystallized from acetone (Ig doxylamine succinate: 2.5mL acetone). Steps above, doxylamine succinate, and recrystallized to give 1.6g, 82% yield. Mp 101-103 ° C.

] 1HNMr (CDCI3), δ: 8 · 54 (1Η, m), 7 · 69 (1Η, m), 7 · 51 (1Η, m), 7 · 32 (2Η, m), 7 · 30 ( 2Η, m), 7. 23 (1Η, m), 7. 16 (1H, m), 3. 63 (2H, m), 3. 18 (2H, m), 2. 80 (6H, s), 2. 54 (4H, s), 1. 99 (3H,S) O

CN1447694A Jun 21, 2001 Oct 8, 2003 达切斯内公司 Rapid onset formulation
1 Bachman, G. Bryant等.Heterogeneous bimolecular reduction. II. Direct acylation of pyridine and its homologs and analogs.《Journal of Organic Chemistry》.1957,第22卷1302-1308.
2 CHARLESH . TILFORD等.Histamine Antagonists. Basically Substituted Pyridine Derivatives.《Journal of the American Chemical Society 》.1948,第70卷4001-4009.


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Nepal, bhaktapur


Morning street in Bhaktapur, a UNESCO World Heritage Site on the east corner of the Kathmandu Valley, Bagmati, Nepal. Bhaktapur is an ancient Newar town, .

Devotees offer prayer by rolling on the street of Bhaktapur, near Kathmandu in Nepal

Map of bhaktapur.

2,000-year-old herb regulates autoimmunity and inflammation / Chang Shan, from a type of hydrangea that grows in Tibet and Nepal


Researchers discover molecular secrets of ancient Chinese herbal remedy

BOSTON, Mass. (February 12, 2012)—For roughly two thousand years, Chinese herbalists have treated Malaria using a root extract, commonly known as Chang Shan, from a type of hydrangea that grows in Tibet and Nepal. More recent studies suggest that halofuginone, a compound derived from this extract’s bioactive ingredient, could be used to treat many autoimmune disorders as well. Now, researchers from the Harvard School of Dental Medicine have discovered the molecular secrets behind this herbal extract’s power.

It turns out that halofuginone (HF) triggers a stress-response pathway that blocks the development of a harmful class of immune cells, called Th17 cells, which have been implicated in many autoimmune disorders.

“HF prevents the autoimmune response without dampening immunity altogether,” said Malcolm Whitman, a professor of developmental biology at Harvard School of Dental Medicine and senior author on the new study. “This compound…

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