CN1753906A - 培哚普利和其可药用盐的新合成方法 - Google Patents

培哚普利和其可药用盐的新合成方法 Download PDF

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CN1753906A
CN1753906A CNA2004800054059A CN200480005405A CN1753906A CN 1753906 A CN1753906 A CN 1753906A CN A2004800054059 A CNA2004800054059 A CN A2004800054059A CN 200480005405 A CN200480005405 A CN 200480005405A CN 1753906 A CN1753906 A CN 1753906A
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T·迪比费
P·朗格卢瓦
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Abstract

本发明涉及式(I)的培哚普利和其可药用盐的合成方法。

Description

培哚普利和其可药用盐的新合成方法
本发明涉及式(I)的培哚普利和其可药用盐的合成方法:
培哚普利和其可药用盐、尤其是其叔丁基胺盐具有有价值的药理学性质。
它们的主要性质是对血管紧张素I转化酶(或激肽酶II)具有抑制作用,该作用一方面可以阻止十肽的血管紧张素I转化成八肽的血管紧张素II(一种血管收缩剂),另一方面可以阻止缓激肽(一种血管舒张剂)降解成无活性的肽。
这两种作用使得培哚普利在心血管疾病中、尤其是在高血压和心力衰竭中具有有益的作用。
培哚普利、其制备方法以及在治疗中的应用描述于欧洲专利说明书EP 0 049 658。
考虑到该化合物的药理学价值,最重要的是能够通过有效的合成方法获得这种化合物,所述方法易于转化到工业化规模,能够以良好的收率和优异的纯度得到培哚普利,并且原料价格合理。
EP 0 308 341描述了工业化合成培哚普利的方法,该方法包括使(2S,3aS,7aS)-八氢吲哚-2-甲酸苄基酯与N-[(S)-1-羧基丁基]-(S)-丙氨酸乙酯反应,再通过催化氢化将杂环的羧酸基团脱保护。
但是,(2S,3aS,7aS)-八氢吲哚-2-甲酸酯不能购买到,并且其制备过程需要采用以吲哚-2-甲酸为原料的多步合成步骤(包括拆分步骤)。
本申请人现已开发出了由易于获得的原料合成培哚普利的新方法。
更具体地说,本发明涉及培哚普利和其可药用盐的工业化合成方法,其特征在于,使式(II)的1-(1-环己烯-1-基)-吡咯烷:
Figure A20048000540500051
与式(III)的化合物反应:
Figure A20048000540500052
其中,R1表示酸官能团保护基团,R2表示胺官能团的保护基团,得到式(IV)的化合物:
其中,R1和R2如前定义,
在进行环化前对胺官能团进行脱保护,再进行脱水,得到式(V)的化合物:
Figure A20048000540500054
其中R1如前定义,
或其与无机或有机酸的加成盐,
将其与式(VI)的化合物在乙酸乙酯中、在20至77℃的温度下反应:
反应在1-羟基苯并三唑和二环己基碳二亚胺存在下进行,以每摩尔所采用的式(V)化合物的量计,1-羟基苯并三唑的量为0.4-0.6摩尔,二环己基碳二亚胺的量为1-1.2摩尔,
反应在三乙胺存在下进行,以每摩尔所采用的式(V)化合物的量计,三乙胺的量为0.25-1.2摩尔,
在分离后得到式(VII)的化合物:
其中,R1如前定义,
将其在催化剂例如钯、铂、铑或镍的存在下、在1-30巴,优选1-10巴的氢气压力下进行氢化,在对酸官能团脱保护后,得到式(I)的培哚普利,如果需要的话,可将其转化成可药用盐如叔丁基胺盐。
以下实施例用于说明本发明,但并非对本发明的限制。
实施例:(2S,3aS,7aS)-1-{(2S)-2-[(1S)-1-(乙氧羰基)-丁基氨基]-丙酰基}-八氢-1H-吲哚-2-甲酸叔丁基胺盐
步骤A:(2S)-2-[(叔丁氧羰基)-氨基]-3-(2-氧代环己基)-丙酸苄酯
在备有回流柱的反应器中,加入200g 1-(1-环己烯-1-基)-吡咯烷、535g(2S)-2-[(叔丁氧羰基)-氨基]-3-碘丙酸苄酯和1.5L乙腈。
回流1小时,然后将混合物恢复至室温。蒸出溶剂后,加入2L水,再加入乙酸。用乙酸乙酯萃取,蒸发至干。
以此方式获得(2S)-2-[(叔丁氧羰基)-氨基]-3-(2-氧代环己基)-丙酸苄酯,收率为80%。
步骤B:(2S)-2-氨基-3-(2-氧代环己基)-丙酸苄酯
在反应器中,加入200g前一步骤获得的化合物、1,5L二氯甲烷和60g三氟乙酸。在室温下搅拌1小时30分钟后,加入2L饱和碳酸氢钠溶液。用二氯甲烷萃取并蒸发至干。
以此方式获得(2S)-2-氨基-3-(2-氧代环己基)-丙酸苄酯,收率为90%。
步骤C:(2S)-2,3,4,5,6,7-六氢-1H-吲哚-2-甲酸苄酯对甲苯磺酸盐
在反应器中,回流200g前一步骤获得的化合物、151.9g对甲苯磺酸和1L甲苯,通过共沸蒸馏除去形成的水。当不再分离出水时,蒸出甲苯。
以此方式获得(2S)-2,3,4,5,6,7-六氢-1H-吲哚-2-甲酸苄酯对甲苯磺酸盐,粗品收率为97%。
步骤D:(2S)-1-{(2S)-2-[(1S)-1-(乙氧羰基)-丁基氨基]-丙酰基}-2,3,4,5,6,7-六氢-1H-吲哚-2-甲酸苄酯
在反应器中,加入200g前一步骤获得的化合物、46g三乙胺和1L乙酸乙酯,在室温下搅拌10分钟后,再加入104g N-[(S)-乙氧羰基-1-丁基]-(S)-丙氨酸、30g 1-羟基苯并三唑和100g二环己基碳二亚胺。然后,在良好搅拌下将多相混合物在30℃下加热3小时,然后冷却至0℃并过滤。再将滤液洗涤并蒸发至干,得到目的产物,收率为95%。
步骤E:(2S,3aS,7aS)-1-{(2S)-2-[(1S)-1-(乙氧羰基)-丁基氨基]-丙酰基-八氢-1H-吲哚-2-甲酸
向氢化反应器中加入溶解于乙酸中的200g前一步骤获得的化合物,然后加入5g 10%Pt/C。在5巴的压力和室温下进行氢化,直至吸收了理论量的氢气。过滤除去催化剂,然后冷却至0-5℃,过滤收集形成的固体。洗涤滤饼,干燥至恒重。以此方式获得(2S,3aS,7aS)-1-{(2S)-2-[(1S)-1-(乙氧羰基)-丁基氨基]-丙酰基}-八氢-1H-吲哚-2-甲酸,收率为85%,对映体纯度为99%。
步骤F:(2S,3aS,7aS)-1-{(2S)-2-[(1S)-1-(乙氧羰基)-丁基氨基]-丙酰基}-八氢-1H-吲哚-2-甲酸叔丁基胺盐
将前一步骤获得的化合物(200g)溶解于2.8L乙酸乙酯,然后加入40g叔丁基胺和0.4L乙酸乙酯。然后,将获得的悬浮液回流,直至完全溶解,再将获得的溶液趁热过滤,搅拌下冷却至15-20℃。然后,滤出获得的沉淀,再次用乙酸乙酯成糊,干燥然后粉碎,得到目的产物,收率为95%。

Claims (4)

1.式(I)的培哚普利和其可药用盐的合成方法,
Figure A2004800054050002C1
其特征在于,使式(II)的1-(1-环己烯-1-基)-吡咯烷:
Figure A2004800054050002C2
与式(III)的化合物反应:
Figure A2004800054050002C3
其中,R1表示酸官能团保护基团,R2表示胺官能团的保护基团,
得到式(IV)的化合物:
Figure A2004800054050002C4
其中,R1和R2如前定义,
在进行环化前对胺官能团进行脱保护,再进行脱水,得到式(V)的化合物:
Figure A2004800054050002C5
其中R1如前定义,
或其与无机或有机酸的加成盐,
将其与式(VI)的化合物在乙酸乙酯中、在20至77℃的温度下反应:
反应在1-羟基苯并三唑和二环己基碳二亚胺存在下进行,以每摩尔所采用
的式(V)化合物的量计,1-羟基苯并三唑的量为0.4-0.6摩尔,二环己基碳二
亚胺的量为1-1.2摩尔,
反应4在三乙胺存在下进行,以每摩尔所采用的式(V)化合物的量计,三乙
胺的量为0.25-1.2摩尔,
在分离后得到式(VII)的化合物:
Figure A2004800054050003C2
其中,R1如前定义,
将其在催化剂的存在下、在1-30巴的氢气压力下进行氢化,在对酸官能团脱保护后,得到式(I)的培哚普利,如果需要的话,可将其转化成可药用盐如叔丁基胺盐。
2.根据权利要求1的合成方法,其特征在于,氢化反应中的氢气压力为1-10巴。
3.根据权利要求1的合成方法,其中,催化剂选自钯、铂、铑和镍。
4.根据权利要求1的方法,用于合成叔丁基胺盐形式的培哚普利。
CNB2004800054059A 2003-02-28 2004-02-27 培哚普利和其可药用盐的新合成方法 Expired - Fee Related CN1326871C (zh)

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US7732621B2 (en) * 2004-12-28 2010-06-08 Dsm Ip Assets B.V. Process for the preparation of enantiomerically enriched indoline-2-carboxylic acid
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