Asymmetric<i>syn</i>-Aldol Reaction of α-Hydroxy Ketones with Tertiary Amine Catalysts
作者:Sebastian Baś、Łukasz Woźniak、Judyta Cygan、Jacek Mlynarski
DOI:10.1002/ejoc.201300872
日期:2013.10
The tertiary amine-catalyzed direct asymmetric aldol reaction of 2-hydroxyacetophenones (2-hydroxy-1-arylethanones) with a variety of aliphatic aldehydes has been demonstrated. By using 20 mol-% of unmodified cinchonine as catalyst, the direct aldol reaction products were isolated in good yields and with remarkably high syn diastereocontrol and good asymmetric induction (40–78 % ee). This newly elaborated
已经证明了叔胺催化的 2-羟基苯乙酮(2-羟基-1-芳基乙酮)与多种脂肪醛的直接不对称醛醇反应。通过使用 20 mol% 的未改性辛可宁作为催化剂,直接醛醇反应产物以良好的产率分离,并具有非常高的顺式非对映控制和良好的不对称诱导(40-78% ee)。这种新设计的叔胺催化的直接不对称醛醇反应已将有机催化过程的范围扩展到芳香族 α-羟基酮,迄今为止,这些酮对烯胺催化没有反应。