WO2021238963A1 - 一种(s)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法 - Google Patents

一种(s)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法 Download PDF

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WO2021238963A1
WO2021238963A1 PCT/CN2021/095965 CN2021095965W WO2021238963A1 WO 2021238963 A1 WO2021238963 A1 WO 2021238963A1 CN 2021095965 W CN2021095965 W CN 2021095965W WO 2021238963 A1 WO2021238963 A1 WO 2021238963A1
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acid
compound
potassium
added
phenyl
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PCT/CN2021/095965
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French (fr)
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胡海文
胡范
周玉宝
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杭州中美华东制药有限公司
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Priority to US18/000,102 priority Critical patent/US20230348483A1/en
Priority to EP21812542.5A priority patent/EP4159719A4/en
Priority to CN202180038387.8A priority patent/CN115667219A/zh
Publication of WO2021238963A1 publication Critical patent/WO2021238963A1/zh

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D491/00Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/02Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
    • C07D491/04Ortho-condensed systems
    • C07D491/056Ortho-condensed systems with two or more oxygen atoms as ring hetero atoms in the oxygen-containing ring
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D213/00Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/24Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D213/54Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
    • C07D213/55Acids; Esters

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  • the invention belongs to the technical field of drug synthesis, and specifically relates to (S)-2-(3S,8S)-3-(4-(3,4-dichlorobenzyloxy)phenyl-7-((S)-1- (Phenylpropyl)-2,3,6,7,8,9-hexahydro-[1,4]-dioxeino[2,3-g]isoquinoline-8-carboxamido)
  • S -2-amino-3-(4-(2,3 -The preparation method of dimethylpyridin-4-yl)phenyl)propionic acid methyl ester diacid salt.
  • Compound A contains four chiral centers, of which (S)-2-amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester diacid salt is The synthesis introduces the last chiral center, which is a key intermediate in its preparation process.
  • CN102378574B discloses a method for synthesizing the free base of compound A, which specifically discloses (S)-3-(4-bromo-phenyl)-2-tert-butoxycarbonylamino-propionic acid methyl ester VI as a starting material, (S)-2-amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester di salt was prepared by Suzuki coupling, deprotection and other 3-step reactions Salt (IV).
  • reaction step disclosed in the prior art is to add bis(pinacolyl) diboron (VII) to compound VI, stir at 75°C for 3 hours under the protection of nitrogen, and obtain (S)- after purification using a chromatographic column.
  • the present invention provides a key intermediate of compound A (S)-2-amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester diacid salt Compared with the prior art, the method does not require separation and purification through a chromatographic column, has the advantages of low cost and high yield, and is more suitable for industrial production.
  • the preparation method of the present invention is as follows:
  • step (d) is further carried out: after compound IV is freed, it is mixed with an acid selected from organic acid or inorganic acid, and compound V can be obtained after purification by salt formation.
  • the step (a) is carried out under the protection of inert gas.
  • the compound I and the organic acid salt are added to the solvent first, and the temperature of the mixture is maintained at -10 to 10°C;
  • the organic acid salt is selected from potassium acetate, sodium acetate, Potassium oxalate, sodium oxalate, sodium citrate, potassium citrate, potassium L-tartrate, sodium L-tartrate, potassium malate, sodium malate, potassium succinate, sodium succinate, potassium maleate, sodium maleate
  • the solvent is selected from one or more of xylene, toluene or chlorobenzene.
  • the bis(pinacol) diboron is added in two portions, and the reaction temperature is -10 ⁇ 10°C during the first addition, and the second time The reaction temperature during the addition is 20-30°C.
  • catalyst a is added; the catalyst a is selected from a palladium catalyst alone, or a palladium catalyst and The organic phosphine ligand mixed system, wherein the palladium catalyst is selected from Pd 2 (dba) 3 , PdCl 2 (PPh 3 ) 2 , Pd(OAc) 2 , and the organic phosphorus ligand is selected from PCy 3 , PPh 3, n -Bu 3 P, one or more of P(OMe) 3 , preferably Pd 2 (dba) 3 and PCy 3 are mixed and used.
  • the reaction temperature after adding the catalyst is 100-135°C, preferably 110-120°C.
  • the molar ratio of the compound I, the organic acid salt and the bis(pinacol) diboron is 1:2:2 to 1:4:3
  • the amount of the catalyst used is 0.1-1% by mole of the compound I.
  • the post-reaction treatment method of step (a) is as follows: add heptane to dilute and stir, filter the insoluble matter, extract the filtrate with dilute hydrochloric acid, and wash the resulting aqueous layer with dichloromethane or ethyl acetate , Remove the organic layer, and concentrate the water layer to 2-5 times the volume of compound I to obtain compound II.
  • the concentration of the dilute hydrochloric acid during the post-treatment is 1 to 2 mol/L.
  • the step (b) is carried out under the protection of inert gas.
  • step (b) water and an organic solvent are added to the compound II concentrate, and an alkaline reagent a is added to adjust the pH to about 7;
  • the organic solvent is selected from ethanol, n-propyl One or more of alcohol, n-butanol, tetrahydrofuran, 1,4-dioxane, toluene, and xylene, preferably ethanol;
  • the alkaline reagent a is selected from sodium carbonate, potassium carbonate, cesium carbonate, One or more of lithium carbonate is preferably sodium carbonate;
  • the feeding ratio of 4-bromo-L-phenylalanine to compound II is 1:1.5 to 1:2.5, preferably 1:2.
  • the alkaline reagent b and 4-bromo-L-phenylalanine are added in sequence, and the reaction temperature is adjusted to 30-40°C;
  • the alkaline reagent is selected from one or more of sodium carbonate, potassium carbonate, cesium carbonate, lithium carbonate, barium hydroxide, and potassium phosphate, preferably sodium carbonate.
  • a catalyst b is added, and the catalyst b is selected from a palladium catalyst alone, or a mixed system of a palladium catalyst and an organophosphine ligand, wherein the palladium catalyst is selected from Pd( OAc) 2 , Pd 2 (dba) 3 , PdCl 2 (PPh 3 ) 2, PdCl 2 dppf, Pd(PPh 3 ) 4 , the organophosphine ligand is selected from Ph 2 P(CH 2 ) 2 PPh 2 (dppe ), Ph 2 P(CH 2 ) 3 PPh 2 (dppp), PCy 3 , n-Bu 3 P, P(OMe) 3 , one or more of PPh 3 , preferably Pd 2 (dba) 3 and PCy 3 is used in combination, the amount of the catalyst is 1 to 5% by mole of 4-bromo-L-phenylalanine; the reaction temperature is 60
  • the post-reaction treatment method of step (b) is: concentration under reduced pressure, evaporate 4 times the volume of 4-bromo-L-phenylalanine solvent, and then add purified water to the original volume, Extract with ethyl acetate or dichloromethane to separate the organic phase; add acid dropwise to the aqueous phase to adjust the pH to 1-2, and filter; extract the filtrate with ethyl acetate or dichloromethane to separate the organic phase, and add hydroxide to the aqueous phase Adjust the pH of the sodium aqueous solution to 5-8, stir and crystallize to obtain compound III; the acid used for adjusting the pH is one of hydrochloric acid, sulfuric acid, and phosphoric acid, preferably hydrochloric acid.
  • step (c) methanol is used as a solvent and a reagent at the same time, and oxalyl chloride or thionyl chloride is optionally added, and the reaction temperature is controlled at 40-70°C, preferably 55-65 °C.
  • step (c) is concentrated to remove the solvent after the reaction is completed to obtain compound IV.
  • step (d) an alkaline aqueous solution is added to the product of step (c) to adjust the pH, and then a solvent is used to extract 1 to 3 times, the water phase is separated, and the organic phase is concentrated to obtain compound IV
  • the free base; the extraction solvent is selected from one of ethyl acetate, dichloromethane, isopropyl acetate, butyl acetate or 2-methyltetrahydrofuran.
  • the free alkali solution of compound IV is uniformly mixed with the solvent, and then an organic acid or inorganic acid solution is added, and the mixture is stirred to form salt and crystallize to obtain compound V.
  • the solvent is selected from one or more of dichloromethane, acetone, isopropanol, acetonitrile, and tetrahydrofuran, the organic acid or inorganic acid
  • the organic acid or inorganic acid One selected from oxalic acid, L-tartaric acid, malic acid, succinic acid, maleic acid, citric acid, phosphoric acid, sulfuric acid, hydrobromic acid; preferably oxalic acid or phosphoric acid; the organic acid or inorganic acid is dissolved in acetone, methanol Or in ethanol.
  • the (S)-2-amino-3-[4-(2) prepared through the steps (a) to (c), or through the steps (a) to (d) ,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester diacid salt is a key intermediate in the preparation of compound A.
  • di-acid salt means that the free base and the acid form a salt at a molar ratio of 1:2, and the acid includes organic acid and inorganic acid.
  • the preparation method of (S)-2-amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester diacid salt of the present invention is relatively Technically speaking, the process route has low raw material cost and high yield, does not need to be purified by a chromatographic column, and is more suitable for industrial production.
  • (S)-(S)-(S)-(S)-(S)-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester dihydrochloride is further prepared from (S)-2-amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester dihydrochloride 2-Amino-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid methyl ester diacid salt has better storage stability.
  • the experimental methods without specific conditions are usually conventional conditions, or according to the conditions recommended by the raw material or commodity manufacturers;
  • the reagents without an indication of the source are usually conventional reagents that are commercially available.
  • the detection equipment used in the present invention is:
  • the content of phosphorus is 12.3%, which is measured in the four general rules 3103, which proves that it contains two molecules of phosphoric acid, that is, the molecular formula is C 17 H 20 N 2 O 2 ⁇ 2H 3 PO 4 .
  • the properties of the prepared salt (oxalate, phosphate) and hydrochloride were compared, and the stability inspection experiment under 40°C/75% humidity was carried out.
  • the chemical purity (HPLC) was tested and the product shape was observed.
  • the chemical stability was evaluated, and the detailed experimental results are shown in Table 2. The results show that by changing the salt type, the moisture absorption of the solid can be improved, so as to prevent the product from deteriorating due to water absorption during storage.

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Abstract

本发明提供了一种(S)-2-(3S,8S)-3-(4-(3,4-二氯苄氧基)苯基-7-((S)-1-苯丙基)-2,3,6,7,8,9-六氢-[1,4]-二氧杂环己烯并[2,3-g]异喹啉-8-甲酰氨基)-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸二盐酸盐的关键中间体(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐的制备方法,该方法与现有技术相比,无需经过色谱柱分离纯化,具有成本低、收率高的优点,更适合于工业化生产。

Description

一种(S)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法 技术领域
本发明属于药物合成技术领域,具体涉及(S)-2-(3S,8S)-3-(4-(3,4-二氯苄氧基)苯基-7-((S)-1-苯丙基)-2,3,6,7,8,9-六氢-[1,4]-二氧杂环己烯并[2,3-g]异喹啉-8-甲酰氨基)-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸二盐酸盐的关键中间体(S)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法。
背景技术
(S)-2-(3S,8S)-3-(4-(3,4-二氯苄氧基)苯基-7-((S)-1-苯丙基)-2,3,6,7,8,9-六氢-[1,4]-二氧杂环己烯并[2,3-g]异喹啉-8-甲酰氨基)-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸二盐酸盐(化合物A),是非肽类小分子胰高血糖素样肽-1受体(GLP-1R)激动剂,其分子式为C 50H 49Cl 4N 3O 6,分子量为929.76,其化学结构式如下:
Figure PCTCN2021095965-appb-000001
化合物A含有四个手性中心,其中,(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐为合成引入最后一个手性中心,是其制备过程中的关键中间体。
CN102378574B公开了合成化合物A游离碱的方法,其中具体公开了由(S)-3-(4-溴-苯基)-2-叔丁氧基羰基氨基-丙酸甲酯VI作为起始物料,通过Suzuki偶联,脱保护等3步反应制备得到(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二盐酸盐(IV)。
Figure PCTCN2021095965-appb-000002
具体而言,现有技术公开的反应步骤是向化合物VI中加入二(频哪醇基)二硼(VII),在氮气保护下75℃搅拌3小时,使用色谱柱纯化后得到(S)-2-叔丁氧基羰基氨基-3-[4-(4,4,5,5-四甲基-[1,3,2]二氧杂环戊硼烷-2-基)-苯基]-丙酸甲基酯(VIII),然后加入4-溴-2,3-二甲基-吡啶(IX),在氮气保护下,于80℃搅拌18小时,使用色谱柱纯化后 得到(S)-2-叔丁氧基羰基氨基-3-[4-(2,3-二甲基-吡啶-4-基)-苯基]-丙酸甲基酯(X),最后脱保护得到(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二盐酸盐(IV)。
在上述反应中,需要多次用到色谱柱分离纯化,总收率仅49%,且原料化合物VI和化合物IX较为昂贵,此外,经实验发现,化合物IV极易吸湿变质,较难通过常规的溶剂析晶方式获得固体化合物,储存和运输难度大,不适合工业化生产。
因此,有必要优化化合物A的关键中间体(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐的制备方法,同时寻找可替换的盐型,提高收率,降低成本,以适用于工业化生产。
发明内容
本发明提供了一种化合物A的关键中间体(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐的制备方法,该方法与现有技术相比,无需经过色谱柱分离纯化,具有成本低、收率高的优点,更适合于工业化生产。
本发明的制备方法如下:
Figure PCTCN2021095965-appb-000003
步骤(a):化合物I与二(频哪醇基)二硼反应制备化合物II;
步骤(b):化合物II与4-溴-L-苯丙氨酸反应制备化合物III;
步骤(c):化合物III经酯化反应制备化合物IV。
任选地,进一步进行步骤(d):化合物IV经游离后,再与选自有机酸或无机酸的酸混合,经成盐纯化后可获得化合物V。
作为一种具体的实施方案,所述步骤(a)在惰性气体保护下进行。
作为一种具体的实施方案,所述步骤(a)中,化合物I和有机酸盐先加入溶剂中,保持混合物温度在-10~10℃;所述有机酸盐选自醋酸钾,醋酸钠,草酸钾,草酸钠,柠檬酸钠,柠檬酸钾,L-酒石酸钾,L-酒石酸钠,苹果酸钾,苹果酸钠,琥珀酸钾,琥珀酸钠,马来酸钾,马来酸钠的一种或两种以上,优选醋酸钾;所述溶剂选自二甲苯,甲苯或氯苯中的一种或两种以上。
作为一种具体的实施方案,所述步骤(a)中,所述的二(频哪醇基)二硼分两次加入,第一次加入时反应温度为-10~10℃,第二次加入时反应温度为20~30℃。
作为一种具体的实施方案,所述步骤(a)中,二(频哪醇基)二硼第二次反应完全后,加入催化剂a;所述催化剂a单独选自钯催化剂,或钯催化剂与有机膦配体混合 体系,其中所述钯催化剂选自Pd 2(dba) 3,PdCl 2(PPh 3) 2,Pd(OAc) 2,所述有机磷配体选自PCy 3,PPh 3,n-Bu 3P,P(OMe) 3中的一种或两种以上,优选Pd 2(dba) 3和PCy 3混合使用。
作为一种具体的实施方案,所述步骤(a)中,加入催化剂后的反应温度为100~135℃,优选110~120℃。
作为一种具体的实施方案,所述步骤(a)中,所述化合物I,有机酸盐和二(频哪醇基)二硼的投料摩尔比为1:2:2~1:4:3,所述催化剂用量为化合物I的0.1~1%倍摩尔量。
作为一种具体的实施方案,所述步骤(a)反应后处理方法为:加入庚烷稀释并搅拌,过滤不溶物,滤液用稀盐酸萃取,得到的水层用二氯甲烷或乙酸乙酯洗涤,除去有机层,并浓缩水层至化合物I的2~5倍体积,得到化合物II。
作为一种具体的实施方案,所述步骤(a)中,后处理过程中所述稀盐酸浓度为1~2mol/L。
作为一种具体的实施方案,所述步骤(b)在惰性气体保护下进行。
作为一种具体的实施方案,所述步骤(b)中,向化合物II浓缩液中加入水和有机溶剂,并加入碱性试剂a调节pH至7左右;所述有机溶剂选自乙醇,正丙醇,正丁醇,四氢呋喃,1,4-二氧六环,甲苯,二甲苯中的一种或两种以上,优选乙醇;所述碱性试剂a选自碳酸钠,碳酸钾,碳酸铯,碳酸锂中的一种或两种以上,优选碳酸钠;所述4-溴-L-苯丙氨酸与化合物II的投料比为1:1.5~1:2.5,优选1:2。
作为一种具体的实施方案,所述步骤(b)中,在调节pH后,再依次加入碱性试剂b和4-溴-L-苯丙氨酸,调整反应温度为30~40℃;所述碱性试剂选自碳酸钠,碳酸钾,碳酸铯,碳酸锂,氢氧化钡,磷酸钾中的一种或两种以上,优选碳酸钠。
作为一种具体的实施方案,所述步骤(b)中加入催化剂b,所述催化剂b单独选自钯催化剂,或钯催化剂与有机膦配体的混合体系,其中所述钯催化剂选自Pd(OAc) 2,Pd 2(dba) 3,PdCl 2(PPh 3) 2,PdCl 2dppf,Pd(PPh 3) 4,所述有机膦配体选自Ph 2P(CH 2) 2PPh 2(dppe),Ph 2P(CH 2) 3PPh 2(dppp),PCy 3,n-Bu 3P,P(OMe) 3,PPh 3中的一种或两种以上,优选Pd 2(dba) 3和PCy 3混合使用,所述催化剂用量为4-溴-L-苯丙氨酸的1~5%倍摩尔量;反应温度为60~90℃,优选75~85℃。
作为一种具体的实施方案,所述步骤(b)反应后处理方法为:减压浓缩,蒸除4-溴-L-苯丙氨酸4倍体积的溶剂,再加入纯化水至原体积,并用乙酸乙酯或二氯甲烷萃取,分除有机相;水相滴加酸调节pH至1~2,过滤;滤液用乙酸乙酯或二氯甲烷萃取,分除有机相,水相加入氢氧化钠水溶液调节pH至5~8,搅拌析晶,得到化合物III;调节pH所用酸为盐酸,硫酸,磷酸中的一种,优选盐酸。
作为一种具体的实施方案,所述步骤(c)中,甲醇同时作为溶剂和反应试剂,并任选地加入草酰氯或二氯亚砜,反应温度控制在40~70℃,优选55~65℃。
作为一种具体的实施方案,所述步骤(c)反应结束后浓缩除去溶剂,得到化合物IV。
作为一种具体的实施方案,所述步骤(d)中,对于步骤(c)的产物加入碱性水溶液调节pH,再使用溶剂萃取1~3次,分除水相,有机相浓缩得化合物IV的游离碱;所 述萃取溶剂选自乙酸乙酯,二氯甲烷,乙酸异丙酯,乙酸丁酯或2-甲基四氢呋喃中的一种。
作为一种具体的实施方案,所述步骤(d)中,将化合物IV的游离碱溶液与溶剂混合均匀,再加入有机酸或无机酸的溶液,搅拌成盐析晶,得到化合物V。
作为一种具体的实施方案,所述步骤(d)中,所述溶剂选自二氯甲烷,丙酮,异丙醇,乙腈,四氢呋喃中的一种或两种以上,所述有机酸或无机酸选自草酸,L-酒石酸,苹果酸,琥珀酸,马来酸,柠檬酸,磷酸,硫酸,氢溴酸中的一种;优选草酸或磷酸;所述有机酸或无机酸溶解于丙酮,甲醇或乙醇中。
作为一种具体的实施方案,经由所述步骤(a)至(c),或经由所述步骤(a)至(d)制备得到的(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐是化合物A制备过程中的关键中间体。
术语“二酸盐”是指游离碱与酸以1:2的摩尔比成盐,所述的酸包括有机酸和无机酸。
本发明所述的(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐的制备方法,相对于现有技术来说,该工艺路线的原料成本低、收率高,无需经过色谱柱纯化,更适合于工业化生产。而且,由(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二盐酸盐进一步制备得到的(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐具有更好的储存稳定性。
具体实施方式
下面结合具体实施例对本发明作进一步的详细说明。以下实施例用于理解本发明的方法和核心思想,对于本领域的技术人员来说,在不脱离本发明构思的前提下,进行任何可能的变化或替换,均属于本发明的保护范围。
本发明实施例中未注明具体条件的实验方法,通常为常规条件,或按照原料或商品制造厂商所建议的条件;未注明来源的试剂,通常为通过商业途径可购得的常规试剂。
本发明所使用的检测仪器为:
1.核磁共振仪
仪器型号:Bruker DMX-500
2.质谱仪
仪器型号:Agilent 6460,测试条件:ESI源
实施例1-4反应投料量如表1所示。
表1 实施例1-4反应投料量表
Figure PCTCN2021095965-appb-000004
Figure PCTCN2021095965-appb-000005
实施例1
(a)惰性气体保护下,向化合物I中依次加入二甲苯和醋酸钾。将上述混合物降温至0℃左右,之后加入二(频哪醇基)二硼。该混合物在0℃左右搅拌1小时,然后维持反应液温度在0℃左右,加入二(频哪醇基)二硼。上述混合物保持温度于15℃左右搅拌1小时。得到的反应液继续在20℃左右搅拌至原料反应完全,再加入Pd 2(dba) 3和PCy 3,升温至110~120℃之间,反应8h,反应结束后,降温,加入庚烷稀释,搅拌0.5小时。将反应液中的不溶物过滤,滤液用稀HCl萃取。水层用二氯甲烷洗涤,除去有机层。溶液浓缩至化合物I的2.5倍体积,得到化合物II(收率99%)。
(b)在惰性气体保护下,将水和乙醇加入到化合物II溶液中,然后向反应液中加入碳酸钠,调节溶液pH到7左右。之后,依次将碳酸钠和4-溴-L-苯丙氨酸加入至上述反应液中。将该反应液升温至30~40℃范围内,在氮气氛围下加入Pd 2(dba) 3和PCy 3,升温至80℃左右反应12小时,反应结束后,减压浓缩,蒸除4-溴-L-苯丙氨酸4倍量的溶剂体积,再加入纯化水至原体积。加入二氯甲烷萃取3次,再分除有机相,水相滴加浓盐酸调节pH至1~2,过滤。滤液再用二氯甲烷萃取一次,分除有机相,水相加入 氢氧化钠水溶液调节pH至7左右,搅拌析晶,得到化合物III(收率84%)。
(c)将化合物III加入甲醇中,冷却至0℃。将草酰氯滴加入上述冷却的混合物中,之后将反应液升温至60℃左右反应1.5小时,反应结束后浓缩除去溶剂,得化合物IV。
(d)向化合物IV加入纯化水搅拌至完全溶解,控温20℃以下,滴加碳酸钠水溶液调节pH至8左右,再加入二氯甲烷萃取3次,分除水相,有机相降温至5℃以下,滴加草酸的丙酮溶液,搅拌析晶,得化合物V(收率80%)。1H NMR(500MHz,d6-DMSO)δ8.37(d,J=5.0Hz,1H),7.38-7.16(m,4H),7.15(s,1H),4.35-4.32(m,1H),3.26-3.15(m,2H),3.70(s,3H),2.56(s,3H),2.53(s,3H); 13C NMR(100MHz,d6-DMSO)δ169.5,163.4(4C),158.5,157.8,148.9,145.9,142.0,141.8,140.9,138.7,156.6,149.7,144.1,137.6,134.8,129.5(2C),129.4,128.9(2C),122.6,53.2,52.6,35.7,22.2,15.8;经碳谱证实结构中含2分子草酸,分子式为C 17H 20N 2O 2·2C 2H 2O 4。HRMS(ESI)C 17H 20N 2O 2(以游离碱计)的计算值:285.1598[M+H],实测值:285.1604。
实施例2
(a)在惰性气体保护下,向化合物I中依次加入甲苯和醋酸钾。将上述混合物降温至-5℃左右,之后加入二(频哪醇基)二硼。该混合物在0℃左右搅拌0.5小时,然后维持反应液温度在0℃左右,加入二(频哪醇基)二硼。上述混合物保持温度于10℃左右搅拌1.5小时。得到的反应液继续在25℃搅拌10小时至原料反应完全,再加入Pd 2(dba) 3和PCy 3,升温至110~120℃之间,反应8h,反应结束后,降温,加入正庚烷稀释,搅拌1小时。将反应液中的不溶物过滤,滤液用稀HCl萃取。水层用乙酸乙酯洗涤,除去有机层。溶液浓缩至化合物I的3倍体积,得到化合物II(收率98%)。
(b)在惰性气体保护下,将水和正丙醇加入到化合物II溶液中,然后向反应液中加入碳酸钠,调节溶液pH至7左右。之后,依次将碳酸钠和4-溴-L-苯丙氨酸加入至上述反应液中。将该反应液升温至30~40℃范围内,在氮气氛围下加入PdCl 2(PPh 3) 2和PCy 3,升温至80℃左右反应14小时,反应结束后,减压浓缩,蒸除4-溴-L-苯丙氨酸4倍体积的溶剂,再加入纯化水至原体积。加入乙酸乙酯萃取3次,再分除有机相,水相滴加浓盐酸调节pH至1.5左右,过滤。滤液再用乙酸乙酯萃取一次,分除有机相,水相加入25%的氢氧化钠水溶液调节pH至8,搅拌析晶,得到化合物III(收率85%)。
(c)将化合物III加入甲醇中,冷却至0℃。将二氯亚砜滴加入上述冷却的混合物中,之后将反应液升温至60℃左右反应3小时,反应结束后浓缩除去溶剂,得化合物IV。
(d)向化合物IV加入纯化水搅拌至完全溶解,控温20℃以下,滴加碳酸钠水溶液调节pH至9左右,再加入乙酸乙酯萃取3次,分除水相,有机相降温至5℃以下,滴加草酸的甲醇溶液,搅拌析晶,得化合物V(收率81%)。所得化合物的表征数据同实施例1。
实施例3
(a)在惰性气体保护下,向化合物I中依次加入氯苯和醋酸钾。将上述混合物降温至0℃左右,之后加入二(频哪醇基)二硼。该混合物在0℃左右搅拌1小时,然 后维持反应液温度在0℃左右,加入二(频哪醇基)二硼。上述混合物保持温度于10℃左右搅拌1.5小时。得到的反应液继续在30℃搅拌10小时至原料反应完全,再加入Pd 2(dba) 3和PCy 3,升温至110~120℃之间,反应8h,反应结束后,降温至70℃,用正庚烷稀释,搅拌1小时。将反应液中的不溶物过滤,滤液用稀HCl萃取。水层用二氯甲烷洗涤,除去有机层。溶液浓缩至化合物I的5倍体积,得到化合物II(收率95%)。
(b)在惰性气体保护下,将水和四氢呋喃加入到化合物II溶液中,然后向反应液中加入碳酸钠,调节溶液pH到7左右。之后,依次将碳酸钠和4-溴-L-苯丙氨酸加入至上述反应液中。将该反应液升温至30~40℃范围内,在氮气氛围下加入PdCl 2(PPh 3) 2,升温至80℃左右反应11小时,反应结束后,减压浓缩,蒸除4-溴-L-苯丙氨酸4倍体积的溶剂,再加入纯化水至原体积。加入乙酸乙酯萃取3次,再分除有机相,水相滴加浓盐酸调节pH至1.5左右,过滤。滤液再用乙酸乙酯萃取一次,分除有机相,水相加入氢氧化钠水溶液调节pH至7.5,搅拌析晶,得到化合物III(收率86%)。
(c)将化合物III加入甲醇中,冷却至0℃。将二氯亚砜滴加入上述冷却的混合物中,之后将反应液升温至60℃左右反应1.5小时,反应结束后浓缩除去溶剂,得化合物IV。
(d)向化合物IV加入纯化水搅拌至完全溶解,控温20℃以下,滴加20%碳酸钠水溶液调节pH至8.5,再加入二氯甲烷萃取3次,分除水相,有机相浓缩至干,加入丙酮搅拌降温至5℃以下,滴加磷酸的丙酮溶液,搅拌析晶,得化合物V(收率82%)。 1H NMR(500MHz,d6-DMSO)δ8.30(d,J=5.0Hz,1H),7.36-7.30(m,4H),7.04(s,1H),4.25-4.23(m,1H),3.24-3.11(m,2H),3.68(s,3H),2.51(s,3H),2.16(s,3H); 13C NMR(100MHz,d6-DMSO)δ170.0,157.3,148.3,145.4,138.0,134.7,129.5(2C),128.9(2C),128.4,122.1,53.4,52.5,36.1,23.0,15.8;HRMS(ESI)C 17H 20N 2O 2(以游离碱计)的计算值:285.1598[M+H],实测值:285.1604。参照《中国药典》2015版四部通则3103测得磷含量为12.3%,证明含两分子磷酸,即分子式为C 17H 20N 2O 2·2H 3PO 4
实施例4
(a)在惰性气体保护下,向化合物I中依次加入二甲苯和醋酸钾。将上述混合物降温至0℃,之后加入二(频哪醇基)二硼。该混合物在0℃左右搅拌1小时,然后维持反应液温度在0℃左右,加入二(频哪醇基)二硼。上述混合物保持温度于15℃左右搅拌1小时。得到的反应液继续在25℃左右搅拌至原料反应完全,再加入Pd 2(dba) 3和PCy 3,升温至110~120℃之间反应,反应结束后,降温至70℃,用正庚烷稀释,搅拌1小时。将反应液中的不溶物过滤,用正庚烷洗涤。滤液用稀HCl萃取。水层用二氯甲烷洗涤,除去有机层。溶液浓缩至化合物I的3倍体积,得到化合物II(收率100%)。
(b)在惰性气体保护下,将水和正丙醇加入到化合物II溶液中,然后向反应液中加入碳酸钠,调节溶液pH到7左右。之后,依次将碳酸钠和4-溴-L-苯丙氨酸加入至上述反应液中。将该反应液升温至30~40℃范围内,在氮气氛围下加入PdCl 2(PPh 3) 2,升温至80℃左右反应,反应结束后,减压浓缩,蒸除4-溴-L-苯丙氨酸4倍体积的溶剂,再加入纯化水至原体积。加入二氯甲烷萃取3次,再分除有机相,水相滴加浓盐酸调节pH至1~2,过滤。滤液再用二氯甲烷萃取一次,分除有机相,水相加入氢氧化钠水溶 液调节pH至6左右,搅拌析晶,得到化合物III(收率85%)。
(c)将化合物III加入甲醇中,冷却至0℃。将二氯亚砜滴加入上述冷却的混合物中,之后将反应液升温至60℃左右反应3小时,反应结束后浓缩除去溶剂,得化合物IV。
(d)向化合物IV加入纯化水搅拌至完全溶解,控温20℃以下,滴加碳酸钠水溶液调节pH至8左右,再加入二氯甲烷萃取3次,分除水相,有机相降温至5℃以下,滴加草酸的甲醇溶液,搅拌析晶,得化合物V(收率81%)。所得化合物的表征数据同实施例1。
实施例5:化合物V盐型的对比
将制备得到的盐型(草酸盐,磷酸盐)与盐酸盐进行性质对比,进行40℃/75%的湿度条件下的稳定性考察实验,通过测试化学纯度(HPLC)及观察产品形状来进行化学稳定性评估,详细实验结果如表2所示。结果显示,通过改变盐型种类,可改善固体的引湿性,从而避免产品因为储存中吸水变质。
表2 化合物V盐型稳定性数据
Figure PCTCN2021095965-appb-000006

Claims (9)

  1. 一种式V的(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐的制备方法,其特征在于,包括如下步骤:
    步骤(a):化合物I与二(频哪醇基)二硼反应制备化合物II;
    步骤(b):化合物II与4-溴-L-苯丙氨酸反应制备化合物III;
    步骤(c):化合物III经酯化反应制备化合物IV;
    步骤(d):化合物IV经游离后,再与选自有机酸或无机酸的酸混合,经成盐纯化后可获得化合物V;
    其合成路线如下:
    Figure PCTCN2021095965-appb-100001
    其中化合物V选自草酸盐,L-酒石酸盐,苹果酸盐,琥珀酸盐,马来酸盐,柠檬酸盐,磷酸盐,硫酸盐,氢溴酸盐;优选草酸盐和磷酸盐。
  2. 根据权利要求1所述的方法,其特征在于,所述步骤(a)中加入催化剂a,所述催化剂a单独选自钯催化剂,或钯催化剂与有机膦配体混合体系,其中所述钯催化剂选自Pd 2(dba) 3,PdCl 2(PPh 3) 2,Pd(OAc) 2,所述有机磷配体选自PCy 3,PPh 3,n-Bu 3P,P(OMe) 3中的一种或两种以上;和/或
    所述步骤(b)中加入催化剂b,所述催化剂b单独选自钯催化剂,或钯催化剂与有机膦配体的混合体系,其中所述钯催化剂选自Pd(OAc) 2,Pd 2(dba) 3,PdCl 2(PPh 3) 2,PdCl 2dppf,Pd(PPh 3) 4,所述有机膦配体选自Ph 2P(CH 2) 2PPh 2(dppe),Ph 2P(CH 2) 3PPh 2(dppp),PCy 3,n-Bu 3P,P(OMe) 3,PPh 3中的一种或两种以上;和/或
    所述步骤(a)和(b)中合计使用的催化剂总量占总反应体系的0.1~5%倍摩尔量,其中步骤(a)催化剂用量为化合物I的0.1~1%倍摩尔量,步骤(b)催化剂用量为4-溴-L-苯基丙氨酸的1~5%倍摩尔量。
  3. 根据权利要求1所述的方法,其特征在于,所述步骤(a)中加入有机酸盐,所述的有机酸盐选自醋酸钾,醋酸钠,草酸钾,草酸钠,柠檬酸钠,柠檬酸钾,L-酒石酸钾,L-酒石酸钠,苹果酸钾,苹果酸钠,琥珀酸钾,琥珀酸钠,马来酸钾,马来酸钠中的一种或两种以上;和/或
    所述步骤(b)中在调节pH后,加入碱性试剂b,所述的碱性试剂b选自碳酸钠,碳酸钾,碳酸铯,碳酸锂,氢氧化钡,磷酸钾中的一种或两种以上;和/或
    所述步骤(b)中使用的溶剂选自乙醇,正丙醇,正丁醇,四氢呋喃,1,4-二氧六环,甲苯,二甲苯中的一种或两种以上。
  4. 根据权利要求3所述的方法,其特征在于,所述步骤(a)中,化合物I,有机酸盐和二(频哪醇基)二硼的投料摩尔比为1:2:2~1:4:3;和/或
    步骤(b)中,4-溴-L-苯丙氨酸与化合物II的投料摩尔比为1:1.5~1:2.5,优选1:2。
  5. 根据权利要求1所述的方法,其特征在于,所述步骤(c)中,甲醇同时作为溶剂和反应试剂;和/或
    加入草酰氯或二氯亚砜;和/或
    反应温度控制在40~70℃,优选55~65℃。
  6. 根据权利要求1所述的方法,其特征在于,对于步骤(c)的产物加入碱性水溶液调节pH,再使用溶剂萃取,分除水相,有机相浓缩得化合物IV的游离碱;和/或
    所述萃取溶剂选自乙酸乙酯,二氯甲烷,乙酸异丙酯,乙酸丁酯或2-甲基四氢呋喃中的一种。
  7. 根据权利要求1所述的方法,其特征在于,所述步骤(d)中,将化合物IV的游离碱溶液与溶剂混合均匀,再加入有机酸或无机酸的溶液,搅拌成盐析晶,得到化合物V。
  8. 根据权利要求7所述的方法,其特征在于,所述步骤(d)中,所述溶剂选自二氯甲烷,丙酮,异丙醇,乙腈,四氢呋喃中的一种或两种以上;和/或
    所述有机酸或无机酸选自草酸,L-酒石酸,苹果酸,琥珀酸,马来酸,柠檬酸,磷酸,硫酸,氢溴酸中的一种,优选草酸或磷酸;和/或
    所述有机酸或无机酸溶解于丙酮,甲醇或乙醇中。
  9. 根据权利要求1-8中任一项所述的方法制备的(S)-2-氨基-3-[4-(2,3-二甲基吡啶-4-基)苯基]丙酸甲基酯二酸盐在制备(S)-2-(3S,8S)-3-(4-(3,4-二氯苄氧基)苯基-7-((S)-1-苯丙基)-2,3,6,7,8,9-六氢-[1,4]-二氧杂环己烯并[2,3-g]异喹啉-8-甲酰氨基)-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸二盐酸盐中的应用。
PCT/CN2021/095965 2020-05-28 2021-05-26 一种(s)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法 WO2021238963A1 (zh)

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CN202180038387.8A CN115667219A (zh) 2020-05-28 2021-05-26 一种(s)-2-氨基-3-(4-(2,3-二甲基吡啶-4-基)苯基)丙酸甲酯二酸盐的制备方法

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WO2022262143A1 (zh) * 2021-06-17 2022-12-22 杭州中美华东制药有限公司 一种吡啶硼酸酯的制备方法

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WO2022262143A1 (zh) * 2021-06-17 2022-12-22 杭州中美华东制药有限公司 一种吡啶硼酸酯的制备方法
CN115057845A (zh) * 2022-06-14 2022-09-16 山东罗欣药业集团恒欣药业有限公司 一种阿贝西利的制备方法

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