Oxocarbons and related compounds. Part 25. Heterocycle-fused benzocyclobutenediones. Synthesis of indolo-, benzofuro- and benzothieno-dihydrobenzocyclobutenediones and benzocyclobutenediones
Abstract
A general and efficient procedure has been described for the synthesis of heterocycle-fused dihydrobenzocyclobutenediones and benzocyclobutenediones by reacting (alk-1-enyl)heterocycles with semisquaric chloride.