The aza-MoritaâBaylisâHillman (azaMBH) reaction has been studied for electronically and sterically deactivated Michael acceptors. It is found that electronically deactivated systems can be converted with electron-rich phosphanes and pyridines as catalysts equally well. For sterically deactivated systems clearly better catalytic turnover can be achieved with pyridine catalysts. This is in accordance with the calculated affinities of the catalysts towards different Michael-acceptors.
aza-Morita-Baylis-Hillman (azaMBH) 反应已经针对电子和立体位阻去活化的Michael受体进行了研究。研究发现,电子去活化的系统可以通过使用富电子的膦和
吡啶作为催化剂同样良好地进行转换。对于立体位阻去活化的系统,使用
吡啶催化剂可以更明显地提高催化转化率。这与催化剂对不同Michael受体的计算亲和力相符合。