Latent acetonylation of α,β -enones with allyltrimethylsilane or 2-methyl-2-propenyltrimethylsilane: synthesis of 1,5-diketones and annelation to fused cyclohexenones
Dityltin bis(triflate) is a mild Lewisacid which catalyzes clean Michael addition of enol silylethers. The new catalyst allows to employ various labile acceptors such as methyl vinyl ketone and 2-cyclopentenone which do not undergo smooth reaction with conventional Lewisacids. A variety of enol silylethers are also employable and thus 2-(trimethylsiloxy)propene, the simplest one in this class of
Novel Synthetic Reactions Using Bis(2,2,2-trifluoroethoxy)diorganosulfuranes
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/bcsj.53.2064
日期:1980.7
Alkoxy- or acyloxysulfuranes prepared in situ by the ligand exchange of bis(2,2,2-trifluoroethoxy)diorganosulfuranes with alcohols or carboxylic acids were found to behave as a potential alkylating or acylating reagent for the preparation of unsymmetrical sulfides, ketones, and esters.