Diels-alder reactions of α-vinylidene-γ-butyrolactones.
作者:Frédéric Fotiadu、Albert Archavlis、Gérard Buono
DOI:10.1016/s0040-4039(00)97752-9
日期:1990.1
α-Vinylidene-γ-butyrolactones 2 and 4 are readily prepared via the reaction of ylides 1 or 3 with ketene. Diels-Alder cycloadditions of these compounds with typical dienes are described, addition of 2 to cyclopentadiene giving predominantly the exo stereomer.