Rh Soaked in Polyionic Gel: An Effective Catalyst for Dehydrogenative Silylation of Ketones
摘要:
A polyionic gel- soaked Rh catalyst allows the formation of synthetically useful diphenylsilyl ( DPS) enols under mild conditions. The reaction proceeds through dehydrogenative silylation of ketones, affording the kinetic silyl enol ether in good to excellent yields. The in situ formed DPS enols were directly involved, without purification, in one- pot aldol and Mannich condensations.
Electron deficiency of aldehydes controls the pyrrolidine catalyzed direct cross-aldol reaction of aromatic/heterocyclic aldehydes and ketones in water
作者:Swapandeep Singh Chimni、Dinesh Mahajan
DOI:10.1016/j.tet.2005.03.045
日期:2005.5
A synthetically useful pyrrolidine catalyzed direct cross-aldol reaction of aromatic/heterocyclic aldehydes with ketones in water affords the aldol addition product in up to 93% yield. Electrophilicity of the aldehydes controls the course of the reaction.