The present invention provides a process for preparing N2-[1(S)-ethoxycarbonyl-3-phenylpropyl]-N6-trifluoroacetyl-L-lysine and lisinopril thereof. Lisinopril shows excellent angiotensin converting enzyme inhibitor activity. Friedel-Crafts acylation of benzene with maleic anhydride in the presence of AlCl¿3? affords trans-β-benzoylacrylic acid. Treatment of benzoylacrylic acid with HCl gas in ethanol gives ethyl 2-chloro-4-oxo-4-phenylbutyrate in high yield. The coupling reaction between ethyl 2-chloro-4-oxo-4-phenylbutyrate and trifluoroacetyl-L-lysine benzyl ester in the presence of a base pair and sodium iodide produces alkyl lydine derivative with a good diastereoselectivity. Catalytic hydrogenation of lysine derivative with palladium gives N?2¿-[1(S)-ethoxycarbonyl-3-phenylpropyl]-N6-trifluoroacetyl-L-lysine. This intermediate is activated to form cyclic N-anhydride by using N,N-carbonyldiimidazole and coupled with L-proline methyl ester hydrochloride to give fully protected lisinopril derivative, which is converted into crude lisinopril by hydrolysis.
本发明提供了一种制备N2-[1(S)-乙氧羰基-3-苯基丙基]-N6-三
氟乙酰-
L-赖氨酸及其
琥珀酸二乙酯盐(Lisinopril)的方法。Lisinopril表现出优异的
血管紧张素转换酶抑制活性。在
AlCl3存在下,苯与
马来酸酐进行Friedel-Crafts酰化反应,得到反式-β-苯甲酰
丙烯酸。将苯甲酰
丙烯酸与HCl气体在
乙醇中处理,高收率得到
乙酸2-
氯-4-氧代-4-苯基丁酯。在碱对和
碘化钠存在下,
乙酸2-
氯-4-氧代-4-苯基丁酯与三
氟乙酰-
L-赖氨酸苄酯进行偶联反应,产生具有良好对映选择性的烷基赖
氨酸衍
生物。使用
钯进行催化氢化,得到N2-[1(S)-乙氧羰基-3-苯基丙基]-N6-三
氟乙酰-
L-赖氨酸。使用N,N-羰基二
咪唑激活该中间体形成环状N-酐,并与
L-脯氨酸甲酯盐偶联,形成完全保护的Lisinopril衍
生物,通过
水解转化为粗Lisinopril。