Highly Stereoselective and Scalable <i>anti</i>-Aldol Reactions Using <i>N</i>-(<i>p</i>-Dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide: Scope and Origins of Stereoselectivities
作者:Hua Yang、Subham Mahapatra、Paul Ha-Yeon Cheong、Rich G. Carter
DOI:10.1021/jo1015008
日期:2010.11.5
A highly enantio- and diastereoselective anti-aldol process (up to >99% ee, >99:1 dr) catalyzed by a proline mimetic—N-(p-dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide—has been developed. Catalystloading as low as 2 mol % can be employed. Use of industry-friendly solvents for this transformation as well as neat reaction conditions have been demonstrated. The scope of this transformation on a range
一种由脯氨酸模拟物N- (对十二烷基苯磺酰基)-2-吡咯烷甲酰胺催化的高度对映和非对映选择性反羟醛过程(高达 >99% ee,>99:1 dr)已被开发出来。可以使用低至2mol%的催化剂负载。已经证明可以使用工业友好型溶剂进行这种转化以及纯净的反应条件。探索了这种对一系列醛和酮的转化范围。密度泛函理论计算表明,增强的非对映选择性的起源是由于磺酰胺、亲电子试剂和催化剂烯胺之间存在非经典氢键,有利于 Houk−List 模型中主要的反 Re 醛醇TS 。