OXOCARBONS AND RELATED-COMPOUNDS .25. HETEROCYCLE-FUSED BENZOCYCLOBUTENEDIONES - SYNTHESIS OF INDOLO-DIHYDROBENZOCYCLOBUTENEDIONES, BENZOFURO-DIHYDROBENZOCYCLOBUTENEDIONES AND BENZOTHIENO-DIHYDROBENZOCYCLOBUTENEDIONES AND BENZOCYCLOBUTENEDIONES
Ah. Schmidt et al., OXOCARBONS AND RELATED-COMPOUNDS .25. HETEROCYCLE-FUSED BENZOCYCLOBUTENEDIONES - SYNTHESIS OF INDOLO-DIHYDROBENZOCYCLOBUTENEDIONES, BENZOFURO-DIHYDROBENZOCYCLOBUTENEDIONES AND BENZOTHIENO-DIHYDROBENZOCYCLOBUTENEDIONES AND BENZOCYCLOBUTENEDIONES, Journal of the Chemical Society. Perkin transactions. I, (6), 1996, pp. 497-498
A general and efficient procedure has been described for the synthesis
of heterocycle-fused dihydrobenzocyclobutenediones and benzocyclobute
nediones by reacting (alk-1-enyl)heterocycles with semisquaric chlorid
e.