Synthesis of (1<i>R</i>,2<i>S</i>)-1-Amino-2-vinylcyclopropanecarboxylic Acid Vinyl-ACCA) Derivatives: Key Intermediates for the Preparation of Inhibitors of the Hepatitis C Virus NS3 Protease
作者:Pierre L. Beaulieu、James Gillard、Murray D. Bailey、Colette Boucher、Jean-Simon Duceppe、Bruno Simoneau、Xiao-Jun Wang、Li Zhang、Karl Grozinger、Ioannis Houpis、Vittorio Farina、Heidi Heimroth、Thomas Krueger、Jürgen Schnaubelt
DOI:10.1021/jo050468q
日期:2005.7.1
panecarboxylic acid (vinyl-ACCA) is a key building block in the synthesis of potent inhibitors of the hepatitis C virus NS3 protease such as BILN 2061, which was recently shown to dramatically reduce viral load after administration to patients infected with HCV genotype 1. We have developed a scalable process that delivers derivatives of this unusual amino acid in >99% ee. The strategy was based on
(1 R,2 S)-1-氨基-2-乙烯基环丙烷羧酸(乙烯基-ACCA)是合成丙型肝炎病毒NS3蛋白酶的强效抑制剂(如BILN 2061)的关键组成部分,最近发现该抑制剂具有显着的作用。减少对感染HCV基因型1的患者用药后的病毒载量。我们开发了一种可扩展的方法,可以以> 99%ee的频率提供这种不寻常氨基酸的衍生物。该策略基于使用反式的甘氨酸席夫碱的二烷基化-1,4-二溴-2-丁烯作为亲电试剂可生产外消旋乙烯基ACCA,随后使用易于获得的廉价酯酶(Alcalase 2.4L)进行拆分。检查了在最初的二烷基化步骤中影响非对映异构的因素,并优化了条件以选择性地递送所需的非对映异构体。在酶促拆分步骤中遇到的产物抑制作用最初导致延长的循环时间。通过经由非对映异构体盐形成的化学拆分或在酶促反应中使用强迫条件来富集外消旋乙烯基-ACCA,这既提高了通量,又发展了可行的方法。放大本文所述的化学物质以产生多千克量的该结构单元。