[EN] ORGANOCATALYSTS AND METHODS OF USE IN CHEMICAL SYNTHESIS [FR] ORGANOCATALYSEURS ET PROCEDES D'UTILISATION DE CES DERNIERS DANS LA SYNTHESE CHIMIQUE
The asymmetric direct Michaeladdition of α,β-unsaturated aldehydes with acetophenone catalyzed by a Jørgensen-Hayashi catalyst in methanol was developed and the corresponding Michael products of δ-keto aldehydes could be afforded in up to 82% yield and 98% ee. asymmetric catalysis - Michaeladditions - ketones - aldehydes - enals
Enantioselective Organocatalytic Mukaiyama−Michael Addition of Silyl Enol Ethers to α,β-Unsaturated Aldehydes
作者:Wei Wang、Hao Li、Jian Wang
DOI:10.1021/ol0503337
日期:2005.4.14
enantioselective, organocatalytic Mukaiyama-Michael addition reaction of silylethers and alpha,beta-unsaturated aldehydes has been developed. The process, catalyzed by MacMillan's chiral imidazolidinone, affords delta-keto aldehydes in high yields (56-87%) and high enantioselectivities (85-97% ee). Moreover, the reaction is applicable to a wide range of silylethers and alpha,beta-unsaturated aldehydes and, as such