Ulipristal acetate

17alpha-Acetoxy-11beta-[4-(dimethylamino)phenyl]-19-norpregna-4,9-diene-3,20-dione

(8S,11S,13S,14R,17R)-17-Acetoxy-11-[4-(dimethylamino)phenyl]-19-norpregna-4,9-diene-3,20-dione

EMA:Link, US FDA:link

REVIEW.http://www.fsrh.org/pdfs/ellaOneNewProductReview1009.pdf

126784-99-4  CAS

Ulipristal acetate (trade name EllaOne in the European Union, Ella in the U.S. for contraception,^[1] and Esmya for uterine fibroid) is a selective progesterone receptor modulator (SPRM).

Medical uses

Emergency contraception

For emergency contraception^[2] a 30 mg tablet is used within 120 hours (5 days) after an unprotected intercourse or contraceptive failure.^[3] It has been shown to prevent about 60% of expected pregnancies,^[4] and prevents more pregnancies than emergency contraception with levonorgestrel.^[5] Ulipristal acetate is available by prescription for emergency contraception in over 50 countries, with access through pharmacists without a prescription being tested in the United Kingdom.^[6][7][8][9] Emergency contraception (EC) is a woman’s second chance for primary prevention of pregnancy.

A reproductive-age woman is a candidate for emergency contraception if she seeks care within 120 hours of unprotected intercourse (UPI), which is the window of pregnancy risk associated with a given act of intercourse based upon the estimated lifespan of sperm in the genital tract (Wilcox et al, 1995). Current hormonal methods of emergency contraception prevent at least half of expected pregnancies if taken within 72 hours of UPI (Von Hertzen et al, 1998).

Levonorgestrel at a total dose of 1.5 mg (taken in a single dose or two 0.75 mg doses 12 hours apart) is the current standard for hormonal emergency contraception and is licensed for use up to 72 hours after UPI. Clinical trials involving levonorgestrel used for emergency contraception more than 72 hours after intercourse do not conclusively establish efficacy rates because of insufficient sample size. Nevertheless, these studies reveal a trend towards markedly higher failure rates when levonorgestrel is taken 48 hours or more after unprotected intercourse (von Hertzen et al, 1998; Von Hertzen et al, 2002).

This trend may be explained by levonorgestrel mode of action for emergency contraception. Levonorgestrel acts by interfering with the LH peak but does not appear to interfere with the ovulatory process when taken close to ovulation, a time when intercourse is most likely to lead to fertilization (Croxatto et al, 2004; Marions et al, 2004; Wilcox et al, 2004). For a woman who presents for emergency contraception more than 72 hours after intercourse, the only currently available method proven to be highly effective is insertion of a copper contraceptive intra-uterine device (IUD). However, IUDs are not widely available in many countries and insertion can only be performed by a trained clinician. Furthermore, many women decline IUD insertion as a method of emergency contraception because the procedure is invasive, is relatively expensive and has a risk of complications including uterine perforation on insertion (Grimes et al, 2004). Additionally, many women seeking emergency contraception are not seeking a long acting contraceptive method.

There is, therefore, a need for a new hormonal emergency contraceptive that can be used and is highly effective up to 120 hours after UPI. Ulipristal acetate (also known as CDB-2914) is a selective progesterone receptor modulator that inhibits or delays ovulation in a dose-dependent fashion (Stratton et al, 2000). In a double-blind non-inferiority trial, ulipristal acetate was shown to be as efficacious as levonorgestrel for preventing pregnancy when used within 72 hours of UPI (Creinin et al, 2006). Moreover, study data suggest improved efficacy in preventing pregnancy from 48 to 72 hours when levonorgestrel efficacy markedly wanes. ulipristal acetate for use in providing post coital contraception in a female subject between about 3 to about 5 days, or between about 72 to about 120 hours, after unprotected intercourse.

A subject of the invention is thus a method for providing post coital contraception in a female subject, comprising providing the subject with a therapeutically effective amount of ulipristal acetate, between about 3 to about 5 days, or between about 72 to about 120 hours, after unprotected intercourse. It is further provided a kit comprising i) a dosage form comprising ulipristal acetate and ii) a printed matter stating that ulipristal acetate may be taken within 120 hours or 5 days after unprotected intercourse   Any woman of reproductive age may need post-coital or emergency contraception at some point to avoid an unintended pregnancy. It is meant to be used in situations of unprotected intercourse, such as: when no contraceptive has been used;

when there is a contraceptive failure or incorrect use, including: – condom breakage, slippage, or incorrect use; – non-compliance with dosage regimen for combined oral contraceptive pills; – non-compliance with dosage regimen for progestogen-only pill (minipill); – more than two weeks late for a progestogen-only contraceptive injection (depot- medroxyprogesterone acetate or norethisterone enanthate); – more than seven days late for a combined estrogen-plus-progestogen monthly injection; – dislodgment, delay in placing, or early removal of a contraceptive hormonal skin patch or ring; – dislodgment, breakage, tearing, or early removal of a diaphragm or cervical cap; – failed coitus interruptus (e.g., ejaculation in vagina or on external genitalia); – failure of a spermicide tablet or film to melt before intercourse; – miscalculation of the periodic abstinence method or failure to abstain on fertile day of cycle; – IUD expulsion; or in cases of sexual assault when the woman was not protected by an effective contraceptive method.

Uliprisnil acetate, originally developed at the Research Triangle Institute, is a selective progesterone receptor modulator (SPRM) first launched in the E.U. in 2009 by HRA Pharma as emergency contraception within 120 hours (5 days) of unprotected sexual intercourse or contraceptive failure. The company filed for approval of this indication in the U.S. in 2009 and approval was obtained in 2010. In 2012, the product was approved in the E.U. for the pre-operative treatment of moderate to severe symptoms of uterine fibroids in adult women of reproductive age. First E.U. commercialization took place in Germany in March 2012 followed by the U.K. in April. The compound is being developed in phase II clinical trials at the National Institutes of Health (NIH) for the treatment of uterine fibroids and premenstrual syndrome (PMS). Two formulations of uliprisnil are in early clinical trials at the Population Council for the prevention of pregnancy: a vaginal ring and an intrauterine delivery system (IUS). Watson conducted phase III clinical studies for the treatment of women with anemia associated with uterine leiomyoma, however the development has been discontinued.

Uliprisnil acetate is a well-known steroid that possesses antiprogestational and antiglucocorticoid activity. In preclinical studies, the growth of lead follicles exposed to a midfollicular dose of the compound was delayed in a dose-related fashion, indicating that the compound may have an additional mechanism of action involving progesterone or estrogen antagonism.

In 2007, uliprisnil acetate was licensed to PregLem by HRA Pharma in Europe for the treatment of gynecological disorders excluding contraception. A license for North American was granted to HRA in 2010. In 2010, the compound was licensed to Watson (now Actavis) by HRA Pharma for the commercialization in the U.S. for use as emergency contraception. Also in 2010, Watson (now Actavis) obtained a license to uliprisnil for the treatment of uterine fibroids. In 2011, the product was licensed to Gedeon Richter by HRA Pharma for marketing and distribution in China, Russia and (Commonwealth of Independent States) CIS republics for the treatment of uterine myoma.

Treatment of uterine fibroids

Ulipristal acetate is used for pre-operative treatment of moderate to severe symptoms of uterine fibroids in adult women of reproductive age in a daily dose of a 5 mg tablet.^[10] Treatment of uterine fibroids with ulipristal acetate for 13 weeks effectively controlled excessive bleeding due to uterine fibroids and reduced the size of the fibroids.^[11][12][13] Two intermittent 3-month treatment courses of ulipristal acetate 10 mg resulted in amenorrhea at the end of the first treatment course in 79.5%, at the end of the second course in 88.5% of subjects. Mean myoma volume reduction observed during the first treatment course (−41.9%) was maintained during the second one (−43.7%).^[10

^]

Adverse effects

Common side effects include abdominal pain and temporary menstrual irregularity or disruption. Headache and nausea were observed under long-term administration (12 weeks), but not after a single dose.^[3]

Interactions

Ulipristal acetate is metabolized by CYP3A4 in vitro. Ulipristal acetate is likely to interact with substrates of CYP3A4, like rifampicin, phenytoin, St John’s wort, carbamazepine or ritonavir, therefore concomitant use with these agens is not recommended.^[10][14] It might also interact with hormonal contraceptives and progestogens such as levonorgestrel and other substrates of the progesterone receptor, as well as with glucocorticoids.^[10]

Contraindications

Ulipristal acetate should not be taken by women with severe liver diseases^[3] because of its CYP mediated metabolism. It has not been studied in women under the age of 18.^[15]

Pregnancy

Unlike levonorgestrel, and like mifepristone, ulipristal acetate is embryotoxic in animal studies.^[16] Before taking the drug, a pregnancy must be excluded.^[3] The EMA proposed to avoid any allusion to a possible use as an abortifacient in the package insert to avert off-label use.^[17] It is unlikely that ulipristal acetate could effectively be used as an abortifacient, since it is used in much lower doses (30 mg) than the roughly equipotent mifepristone (600 mg), and since mifepristone has to be combined with a prostaglandin for the induction of abortion.^[18] However, data on embryotoxicity in humans are very limited, and it is not clear what the risk for an abortion or for teratogenicity (birth defects) is. Of the 29 women studied who became pregnant despite taking ulipristal acetate, 16 had induced abortions, six had spontaneous abortions, six continued the pregnancies, and one “was lost to follow-up“.^[19]

Lactation

It is not recommended to breast feed within 36 hours of taking the drug since it is not known whether ulipristal acetate or its metabolites are excreted into the breast milk.^[3][20]

Pharmacokinetics

In animal studies, the drug was quickly and nearly completely absorbed from the gut. Intake of food delays absorption, but it is not known whether this is clinically relevant.^[21] Ulipristal acetate is metabolized in the liver, most likely by CYP3A4, and to a small extent by CYP1A2 and CYP2D6. The two main metabolites have been shown to be pharmacologically active, but less than the original drug. The main excretion route is via the faeces.^[22]

Pharmacodynamics

As a SPRM, ulipristal acetate has partial agonistic as well as antagonistic effects on the progesterone receptor. It also binds to the glucocorticoid receptor, but has no relevant affinity to the estrogen, androgen and mineralocorticoid receptors.^[23] Phase II clinical trials suggest that the mechanism might consist of blocking or delaying ovulation and of delaying the maturation of the endometrium.^[24]

History

Ulipristal acetate was granted marketing authorization by the European Medicines Agency (EMA) in March 2009.^[25] The U.S. Food and Drug Administration approved the drug for use in the United States on 13 August 2010,^[26] following the FDA advisory committee’s recommendation.^[27][28] Watson Pharmaceuticals announced the availability of ulipristal acetate in the United States on 1 December 2010, in retail pharmacies, clinics, and one on-line pharmacy, KwikMed.^[29] Amorphous ulipristal acetate. ASKA is developing ulipristal acetate in Japan under license from HRA Pharma for the treatment of uterine fibroids and for emergency contraception. In March 2014, it was in phase II for both indications (in Japan). Also see the co-published WO2014050106 and WO2014050107. Crystalline polymorphic form C of ulipristal acetate.

Also claims its method of preparation. Appears to be the first filing from the assignee on this API, which was developed by HRA Pharma under license from the RTI, indicated in the US as an emergency contraceptive for prevention of pregnancy. In May 2011, ASKA signed an exclusive licensing agreement with HRA Pharma to develop and commercialize the API . In November 2013, ASKA had begun phase II development for emergency contraception  and uterine fibroids [1339186] in Japan. Also see concurrently published WO2014050105 and WO2014050107. Crystalline polymorphic form B of ulipristal acetate. Also claims process for the preparation and composition comprising the same. Useful for the treatment of uterine leiomyoma.

Appears to be the first filing from the assignee on this API, see concurrently published WO2014050105 and WO2014050106. The drug was developed by HRA Pharma under license from the RTI, indicated in the US as an emergency contraceptive for prevention of pregnancy. In May 2011, ASKA signed an exclusive licensing agreement with HRA Pharma to develop and commercialize the API  In November 2013, ASKA had begun phase II development in Japan for emergency contraception  and uterine fibroids Buccal forms or devices are also useful, such as those described in U.S. patent application 20050208129 , herein incorporated by reference. U.S. patent application 20050208129 describes a prolonged release bioadhesive mucosal therapeutic system containing at least one active principle, with an active principle dissolution test of more than 70% over 8 hours and to a method for its preparation.

Said bioadhesive therapeutic system comprises quantities of natural proteins representing at least 50% by weight of active principle and at least 20% by weight of said tablet, between 10% and 20% of a hydrophilic polymer, and compression excipients, and comprising between 4% and 10% of an alkali metal alkylsulphate to reinforce the local availability of active principle and between 0.1 % and 1% of a monohydrate sugar.

Ulipristal acetate, formerly known as CDB-2914, designates within the context of this application 17α-acetoxy-11β-[4-N,N-dimethylamino-phenyl)-19-norpregna-4,9-diene-3,20-dione, represented by formula I:

Ulipristal acetate, and methods for its preparation, are described e.g., in U.S. Pat. Nos. 4,954,490; 5,073,548, and 5,929,262, as well as in international patent applications WO2004/065405 and WO2004/078709. Ulipristal acetate possesses antiprogestational and antiglucocorticoidal activity, and has been proposed for contraception, in particular for emergency contraception, and for the therapy of various hormonal diseases.

 (Steroids, 2000,65, 395 ~ 400; US5929262A; CN1298409A; CN101466723A). Reaction is as follows:

Properties of this compound are further described in Blithe et al, Steroids. 2003 68(10-13):1013-7. So far, clinical trials have been conducted using oral capsules of ulipristal acetate (Creinin et al, Obstetrics & Gynecology 2006; 108:1089-1097; Levens et al, Obstet Gynecol. 2008, 111(5):1129-36). In order to increase the properties and clinical benefit of this molecule, there is a need for improved formulations thereof

• Ulipristal acetate, formerly known as CDB-2914, is 17α-acetoxy-11β-[4-N, N-dimethylamino-phenyl)-19-norpregna- 4, 9-diene-3, 20-dione, represented by formula I:

  
• It is a well-known steroid, more specifically a 19-norprogesterone, which possesses antiprogestational and antiglucocorticoidal activity. This compound, and methods for its preparation, are described in U. S. Patent Nos. 4,954, 490,5 , 073,548 , and 5,929, 262 , and international patent applications WO2004/065405 and WO2004/078709 . Properties of this compound are further described in Blithe et al, 2003.
• Metabolites of CDB-2914, include those described in Attardi et al, 2004 , e.g. monodemethylated CDB-2914 (CDB-3877) ;didemethylated CDB-2914 (CDB-3963) ; 17alpha-hydroxy CDB-2914 (CDB-3236) ; aromatic A-ring derivative of CDB-2914 (CDB-4183).

  

  

  

  
• It is now proposed to use ulipristal acetate or a metabolite thereof for treating uterine fibroids, more particularly for reducing or stopping bleeding in a patient afflicted with uterine fibroids, reducing the size of uterine fibroids and/or reducing uterine volume More particularly the inventors have shown in a randomized, placebo-controlled, double blinded, parallel trial, that ulipristal acetate significantly reduces fibroid volume after 3 months, and stops bleeding
• Ulipristal acetate or a metabolite thereof alleviates symptoms of uterine fibroids, including bleeding, pelvic pain, pressure.
• Ulipristal acetate or a metabolite thereof is useful for preventing or treating anemia in patients afflicted with uterine fibroids.
• It is also useful for preventing or treating leiomyosarcomas and for preventing dissemination of uterine fibroids to other organs.

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synthesis

http://www.google.com.br/patents/US5929262

CA2216737A1, EP0817793A2, WO1996030390A2, WO1996030390A3

The United States Of America As Represented By The Department Of Health And Human Services EXAMPLE 7 The Preparation of the Compound of Formula (I) (17α-Acetoxy-11β-(4-N,N-dimethylaminophenyl)-19-norpregna-4,9-diene-3,20-dione) From the Compound of Formula (VIII) 340 mL of acetic acid (5.92 mol) were added to a well stirred mixture containing 834 mL of trifluoroacetic anhydride (5.92 mol) in 2,300 mL of methylene chloride under argon. After stirring for 30 minutes at room temperature, 51.3 g of p-toluenesulfonic acid (0.26 mol) were added, and the mixture was chilled to 0 methylene chloride solution containing 128.3 g of the compound of formula (VIII) (0.30 mol) were added, and the reaction mixture was stirred at 0 cautious addition of a 4.5N potassium carbonate solution until the pH was in the range of 7.0-7.5. The reaction mixture was diluted with water and extracted with methylene chloride. The methylene chloride extracts were washed with water and brine, combined, and dried over sodium sulfate.

Evaporation of the solvent gave the acetate of formula (I) as a thick syrup. The above syrup was dissolved in 300 mL of isopropyl alcohol and evaporated. The dissolution and evaporation were repeated three times. Finally, the remaining solid, which retained isopropyl alcohol as solvent of recrystallization, was dissolved in ethyl acetate and evaporated to give a stable foam. The foam was quickly dissolved in ether, and this solution was set aside to crystallize. The solid that formed was collected by filtration, washed with ether, and dried in vacuo to yield 105.7 g of the compound of formula (I) as yellow crystals in 75% yield;

m.p. 183-185 1735 and 1714(–C═O), 1664 and 1661 (conjugated –C═O), 1563, 1518, 1441, 1351, 1305, 1252, 1203, 1171; NMR (CDCl.sub.3) δ0.38 (s, 18-CH.sub.3), 2.10 (s, 17-OAc), 2.14 (s, 21-CH.sub.3), 2.92 (s, –N(CH.sub.3).sub.2, 4.44 (d, C-11 H), 5.83 (br. s, C-4 H), 6.71 and 7.07 (d, aromatic H); MS(EI) m/z (relative intensity) 475(M.sup.+, 41), 134(18), 121 (100). Analysis calculated for C.sub.30 H.sub.37 NO.sub.4 : C, 75.76; H, 7.84; N, 2.94. Found. C, 75.80; H 7.96; N, 3.09.

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SYNTHESIS http://www.google.com/patents/WO2004065405A1?cl=en

CA2514169A1, CA2514169C, CN1753905A, CN100354300C, EP1602662A1, EP2348033A2, EP2348033A3

EXAMPLE 1 Preparation of 17α-aceto-d-llβ-(4-N, N-dimetüaminofeniI)-19-norpregna-4 ,9-dien-3,20-dione [VA-2914] Raw Were charged 38.5 g of 3,3 – (l ,2-etanodioxi)-5α-hydroxy-llβ-(4-N, N-dimethylaminophenyl)-17α-acetoxy-19-norpregna-9-en-20-one [carbinol acetate] purified in a flask under nitrogen atmosphere at a temperature between 20 ° C and 22 ° C, and added 385 ml of deionized water and 17.91 g of HKSO. The resulting suspension was stirred until complete dissolution, for about 4 hours. The end of the reaction was determined by thin layer chromatography (TLC). Then added 3.85 g of neutral Al ₂ O _3, stirred for 30 minutes, the suspension was filtered and the insolubles were washed with 38.5 ml of deionized water. To the filtrate were added 325 ml of ethyl acetate and the pH was adjusted to a constant value between 7.0 and 7.2 with sodium bicarbonate solution to 7% w / v. The phases were allowed to decant for 15 minutes and, after checking the absence of the final product therein by means of TLC, the phases were separated, discarding the aqueous phase. The resultant organic phase was added 192.5 ml of deionized water, stirred for 10 minutes and the phases were allowed to decant for 15 minutes.

After verifying the absence of aqueous phase final product by TLC, the phases were separated, discarding the aqueous phase. The resulting organic phase was concentrated under vacuum to a residue and obtained approximately 28 g of 17α-acetoxy-llβ-(4-N, N-dimethylaminophenyl)-19-norpregna-4,9-dien-3 ,20-dione [NA -2914] raw. EXAMPLE 2 Isopropanol hemisolvate obtaining 17α-acetoxy-llβ-(4-Ν, Ν-dimethylaminophenyl)-19-norpregna-4 ,9-dien-3 ,20-dione The crude 17α-acetoxy-l lβ-(4-Ν, Ν-dimethylaminophenyl)-19-norpregna-4 ,9-dien-3,20-dione obtained in Example 1 was added 2 x 38.5 ml isopropanol concentrating vacuum to a residue both times. The finally obtained solid was added 77 ml of isopropanol and heated until dissolved. Then allowed to cool to a temperature between 0 ° C and 5 ° C, and the temperature was maintained for 1 h. The resulting suspension was filtered and the cake washed with cold isopropanol.

The yield achieved was 96% molar (5.5% isopropanol content). Isopropanol hemisolvate obtemdo NA-2914 has been characterized by IR spectroscopy, DSC and XRD, as indicated in the description, and has the characteristics indicated therein and shown in Figures 1-3.

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A new and efficient method for the synthesis of Ulipristal acetate

http://dx.doi.org/10.1016/j.steroids.2014.03.009

http://www.sciencedirect.com/science/article/pii/S0039128X14000634

In this study, we describe another new and efficient route for preparing Ulipristal acetate. The 1,4-addition compound 5 was greatly improved after the starting material ketone 1 was underwent epoxidation, cyanation, hydroxyl group protection and Grignard addition. The synthetic procedure is only 6 steps and the total yield is about 27.4%, which is much suitable for industrial process.

We have succeeded in finding another convenient and efficient synthetic route for the synthesis of Ulipristal acetate with a good yield.

•The yield of 11β-substituted isomer was greatly improved.

•The 17β-carbonitrile compound was obtained with high purity after the reaction.

•The yield of once Grignard addition dione was greatly improved.

•These synthetic procedures are much suitable for industrial process.

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Volume 78, Issues 12–13, 11 December 2013, Pages 1293–1297

http://www.sciencedirect.com/science/article/pii/S0039128X13002122

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http://www.google.com/patents/CN103145787A?cl=en

Reaction is as follows:

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WO2013063859A1

http://www.google.com/patents/WO2013063859A1?cl=en

Preparation of related reports Uli Division acetate compounds as follows:

1, U.S. Patent US4954490 methods, (see Reaction Scheme 1),

The method is based on the 3 – methoxy -19 – norpregn-1, 3,5 (10), 17 (20) – tetraene as a starting material, in turn by the addition, oxidation, reduction, hydrolysis, addition and elimination, oxidation of 17-hydroxy-19 – norpregn left the -4,9 – 31 women -3, 20 – dione (Compound V2), and then condensed by ethylene glycol, epoxidized-chloroperbenzoic acid, Bonus format, acid hydrolysis, acetylation of 10-step reaction by Uli acetate SECRETARY (Compound 1), and a melting point of 118-121 ° C the product was obtained by recrystallization with methanol ^. Due to the method, the step length, but difficult to obtain a starting material, the complexity of the reaction conditions, the required intermediate product was purified by column chromatography, the total yield is only 0.62%, Gao costs, the instability of the resulting product is not suitable pharmaceutically acceptable. And is not suitable for industrial production.

Reaction Formula I:

2, U.S. Patent No. US5929262 discloses his method Another method for preparing acetic acid Uli Division (see Reaction Scheme II), the reaction of formula II:

The method is based on 3,3 – ethylenedioxy-17) 8 – cyano -19 – norpregn -5 (10)-9 (11) – dien-17 alcohol (compound III) as a starting material, , first with dimethyl chloromethyl silane protected hydroxy, and then at the cryogenic-70Ό obtained by acid hydrolysis with the DBB / LI reagents After the reaction, a condensation reaction with ethylene glycol ketal, epoxy reaction, then the format of the reaction, The acid hydrolysis reaction and the acetylation reaction to obtain the target object and sequentially by treatment with isopropanol, ethyl acetate and crystallized from ether to obtain a yellow product with a melting point of 183-185Ό. The method expensive starting materials prices, harsh reaction conditions, need to be ultra-low temperature and water and oxygen reaction, high cost of low yield (total yield of about 14%), and therefore not suitable for industrial production.

3, World Patent WO2004078709 discloses a method for preparing (see Reaction Scheme III), the method the Πα hydroxy _19_ norpregn _ _4, 9 ₍₁₀₎ _ diene-_ _ _{3, 17-dione} (Compound _{V2 ),} followed by acetylation of 3 – bit carbonyl condensation, epoxy, Bonus format, acid hydrolyzed to give the target. Although the steps are shorter, but a starting material is from Compound VI was prepared by hydrolysis under acidic conditions to obtain a total yield of about 11.8% (starting from the compound VI operator), the actual reaction step is longer, lower yield, higher cost not suitable for industrial production.

In this method, 3,3 – ethylenedioxy -19 – norpregn -5 (10), 9 (11) – dien-17 – one (referred to as 3 – ketal compound II) as a starting material, by the addition of acetylene, benzene sub-sulfonyl chloride, and then by hydrolysis of sodium methoxide, acid hydrolysis, condensation of ethylene glycol, epoxy, Grignard reaction, acid hydrolysis and acetylation reaction of 9-step reaction to obtain a target object, isopropoxy alcohol crystallization with ethanol and water was heated at 70 ° C after 14h excluding solvate crystal. The method uses a greater risk of acetylene and odor of benzene times sulfonyl chloride, especially benzene times, unstable sulfonyl chloride, easy storage, decomposition of impurities involved in the reaction leads to a low yield, and benzene of times sulfonyl chloride of environmental pollution Further crystallization prolonged heating will produce new impurities, the total yield of 13.8% -15.8%, high cost, is not suitable for industrial production.

The existing methods, the methods 1, 2 and 4 are related to the preparation of compound VI, and also the starting materials in Method 3 Hydrolysis of compound VI is obtained. SUMMARY OF THE INVENTION

Technical problems to be solved by the present invention is to overcome these drawbacks,, study design Uli acetate Secretary industrialization production methods.

WO2013063859A1

http://www.google.com/patents/WO2013063859A1?cl=en

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