Facile synthesis of 4-alkylidenebut-2-enolides by double dehydrochlorination of 2,2-dichloro-4-alkylbutanolides
Abstract
Dehydrochlorination of 2,2-dichloro-4-alkyl-butanolides with refluxing pyridine gave 4-alkylidene-but-2-enolides, analogues of protoanemonin.