Applications of vinylogous Mannich reactions. Total synthesis of the angiotensin converting enzyme inhibitor (−)-A58365A
作者:Andreas Reichelt、Scott K Bur、Stephen F Martin
DOI:10.1016/s0040-4020(02)00631-2
日期:2002.8
A concise enantiospecific synthesis of the angiotensin converting enzyme inhibitor (−)-A58365A (7) has been achieved following a strategy in which a vinylogous Mannich reaction and a lactone–lactam rearrangement served as the key transformations. The trimethylsilyloxyfuran derived from 25, which was prepared from the known sulfoxide 16, served as the nucleophilic partner in a vinylogous Mannich reaction
遵循以乙烯基乙烯基曼尼希反应和内酯-内酰胺重排为关键转化的策略,实现了血管紧张素转化酶抑制剂(-)-A58365A(7)的简洁对映体特异性合成。由已知的亚砜16制备的25衍生的三甲基甲硅烷氧基呋喃在乙烯性曼尼希反应中与亲电子N-酰基酰亚胺离子(由缩醛胺26原位生成)反应中作为亲核配偶体。加入另外量的TMSOTf,从加合物27上裂解N- Boc基团,得到非对映体氨基丁烯内酯28的混合物。。用LiOMe / MeOH处理该混合物可得到10,并且在八个步骤的最长线性序列中,酸催化水解的(-)-A58365A递送的甲酯的总产率为37%。