Diastereoselective aldol condensation of directly generated titanium enolates of activated esters.
作者:Rita Annunziata、Mauro Cinquini、Franco Cozzi、Pier Giorgio Cozzi、Emanuela Consolandi
DOI:10.1016/s0040-4020(01)81945-1
日期:1991.9
Simply generated (TiCl4, Et3N, -78-degrees-C) titanium enolates of some thioesters and alpha-thio substituted esters undergo aldol condensations with achiral and chiral aldehydes with low to high stereoselectivity. An H-1-NMR study of the TiCl4/ester complexation and of the enolization process is presented. The relation between the enolate structure and the aldol product stereochemistry is discussed.