An Asymmetric Synthesis of L-694,458, a Human Leukocyte Elastase Inhibitor, via Novel Enzyme Resolution of β-Lactam Esters
作者:Raymond J. Cvetovich、Michel Chartrain、Frederick W. Hartner,、Christopher Roberge、Joseph S. Amato、Edward J. J. Grabowski
DOI:10.1021/jo960618k
日期:1996.1.1
A convergent synthesis of [S-(R,S)]-2-[4-[(4-methylpiperazin-1-yl)carbonyl]phenoxy]-3,3-diethyl-N-[1-[3,4-(methylenedioxy)phenyl]butyl]-4-oxo-1-azetidinecarboxamide (L-694,458, 1), a potent human leukocyte elastase inhibitor, was achieved via chiral synthesis of key intermediates: (S)-3,3-diethyl-4-[4'-[(N-methylpiperazin-1-yl)carbonylphenoxy]-2-azetidinone (2) and (R)-alpha-propylpiperonyl isocyanate
[S-(R,S)]-2- [4-[(4-甲基哌嗪-1-基)羰基]苯氧基] -3,3-二乙基-N- [1- [3,4-]的收敛合成通过重要手性中间体(S)-3,3-diethyl-4的手性合成获得了一种强力的人白细胞弹性蛋白酶抑制剂((亚甲基二氧基)苯基]丁基] -4-氧--1-氮杂环丁烷甲酰胺(L-694,458,1)。 -[[4'-[(N-甲基哌嗪-1-基)羰基苯氧基] -2-氮杂环丁酮](2)和(R)-α-丙基哌啶异氰酸酯(3)。β-内酰胺2的合成是通过酯5的新型对映选择性脂肪酶水解产生(S)-3,3-二乙基-4-(4'-羧苯氧基)-2-氮杂环丁酮(6)(60%收率,三循环,93%ee)分离,差向异构化并回收不需要的(R)-酯5。通过将Zn(n-Pr)(2)手性添加到胡椒醛中制备异氰酸酯3(98%收率,99.2%ee) ),