Asymmetric Strecker Reaction of Aldimines Using Aqueous Potassium Cyanide by Phase-Transfer Catalysis of Chiral Quaternary Ammonium Salts with a Tetranaphthyl Backbone
作者:Takashi Ooi、Yukitaka Uematsu、Keiji Maruoka
DOI:10.1021/ja058066n
日期:2006.3.1
protected amino nitrile (R = c-Hex) in 89% yield with 95% ee. A wide range of aliphatic aldimines, including those having alpha-tert-alkyl substituents, is tolerated by the present system. This study represents a novel approach for the asymmetric Strecker-type reactions, which utilizes chiral phase-transfer catalysts for practical access to various unusual, optically pure alpha-amino acids.
基于带有立体化学定义的四萘基骨架的手性季铵碘化物 2c 的分子设计,已经实现了使用水性 KCN 对醛亚胺进行相转移催化的高对映选择性氰化反应。例如,将环己烷甲二亚胺(R = c-Hex)和(R,R,R)-2c(1 mol%)在甲苯-KCN水溶液(1.5当量)中的混合物在0摄氏度下剧烈搅拌2小时,得到以 89% 的产率和 95% 的 ee 上升为相应的受保护氨基腈 (R = c-Hex)。本系统可耐受多种脂肪族醛亚胺,包括具有α-叔烷基取代基的那些。这项研究代表了不对称 Strecker 型反应的一种新方法,该方法利用手性相转移催化剂实际获得各种不寻常的、光学纯的 α-氨基酸。