Synthesis of Optically Pure Arylsilylcarbinols and Their Use as Chiral Auxiliaries in Oxacarbenium Ion Reactions
作者:John R. Huckins、Scott D. Rychnovsky
DOI:10.1021/jo035260o
日期:2003.12.1
as chiral auxiliaries for oxacarbenium ion reactions. The optically pure arylsilylcarbinols were prepared using Noyori's transfer hydrogenation catalyst 11. The transfer hydrogenation shows very good enantioselectivities and turnover efficiency for the aryl silyl ketones and is the method of choice for preparing these optically pure alcohols. The diastereoselective addition of allyltrimethylsilane to
合成了一个芳基甲硅烷基羰基醇家族,并作为氧杂碳鎓离子反应的手性助剂进行了研究。使用Noyori的转移氢化催化剂11制备光学纯的芳基甲硅烷基甲醇。转移氢化显示出对于芳基甲硅烷基酮非常好的对映选择性和周转效率,并且是制备这些光学纯的醇的选择方法。使用Marko条件研究了将烯丙基三甲基硅烷非对映选择性加成到原位生成的氧杂碳鎓离子上。对于代表性的脂族醛的选择性非常好,但是使用不饱和醛和芳族醛会大大降低选择性。不同助剂的选择性范围很窄,最实用的助剂是苯基甲硅烷基甲醇2。