1,3-Dipolar cycloaddition of mesoionic anhydro-4-hydroxy-1,3-dioxolium hydroxides with olefinic dipolarophiles
Abstract
Stable cycloadducts between mesoionic compounds containing a lactone moiety and olefinic dipolarophiles were isolated for the first time mesoionic 1,3-dioxolium-4-oxides, generated in situ by the intramolecular carbone–carbonyl reaction of α-diazo-acetic benzoic and -bis(acetic) anhydrides.