Ni(II) Bis(oxazoline)-Catalyzed Enantioselective Syn Aldol Reactions of <i>N</i>-Propionylthiazolidinethiones in the Presence of Silyl Triflates
作者:David A. Evans、C. Wade Downey、Jed L. Hubbs
DOI:10.1021/ja035509j
日期:2003.7.1
enantioselective aldol reaction of N-propionylthiazolidinethione and representative aldehydes is disclosed. The reaction is catalyzed by [Ni(S,S)-t-BuBox](Otf)2. Enolization is effected by 2,6-lutidine, and TMSOTf facilitates catalyst turnover. Syn diastereoselectivities range from 88:12 to 97:3, and enantioselectivities are 90% or greater. Both aromatic and enolizable aliphatic aldehydes are included within
公开了N-丙酰基噻唑烷硫酮和代表性醛的对映选择性羟醛反应。该反应由 [Ni(S,S)-t-BuBox](Otf)2 催化。烯醇化受 2,6-二甲基吡啶影响,TMSOTf 促进催化剂周转。合成非对映选择性范围为 88:12 至 97:3,对映选择性为 90% 或更高。芳香族和可烯醇化的脂肪族醛都包括在该醛醇加成过程的范围内。