Enantioselective cyanosilylation of aldehydes catalysed by a diastereomeric mixture of atropisomeric thioureas
作者:Rebecca M. Steele、Chiara Monti、Cesare Gennari、Umberto Piarulli、Federico Andreoli、Nicolas Vanthuyne、Christian Roussel
DOI:10.1016/j.tetasy.2006.03.008
日期:2006.3
New bifunctional atropisomeric thioureas 1 were synthesised and tested as both a mixture of diastereomers (aR/aS)-(R,R)-1 and as single diastereomers (aR)-(R,R)-1 and (aR)-(S,S)-1, in the organocatalysed, enantioselective, cyanosilylation of a range of aldehydes (aromatic and aliphatic). Moderate enantiomeric excesses (up to 69% ee) and quantitative yields were obtained. The best results were achieved
合成并测试了新的双功能阻转异构硫脲1作为非对映异构体(a R / a S)-(R,R)-1的混合物以及作为单一非对映异构体(a R)-(R,R)-1和(a R)-(S,S)-1在一系列醛(芳族和脂族)的有机催化,对映选择性,氰基硅烷化反应中进行。获得了适度的对映体过量(至多69%ee)和定量收率。使用硫脲非对映异构体的混合物(R / aS)-(R,R)-1而不是单个非对映异构体。