Triarylcarbenium ions as catalysts in the Mukaiyama Aldol addition: A mechanistic investigation
作者:Scott E. Denmark、Chien-Tien Chen
DOI:10.1016/s0040-4039(00)73345-4
日期:1994.6
1-Phenyl-2:3,6:7-dibenzosuberyl salts 5+ efficiently catalyze the aldol reaction between silyl enol ethers and benzaldehyde with moderate diastereoselectivity. Crossover experiments with doubly labeled silyl enol ethers, kinetic and stereochemical studies identify 5+ as the catalyst rather than a Lewis acidic R3SiX species in this transformation.