Synthesis of Pentacyclic 13-Azadibenzo[a,de]anthracenes via Anionic Cascade Ring Closure
摘要:
Bromine-lithium exchange using tert-butyllithium at -78 degreesC initiates a cascade process whereby either xanthone derivatives or pentacyclic 13-azadibenzo[a,de]-anthracenes are produced in high yields. The reaction proceeds via a sequential intramolecular trapping of organolithium intermediates.
Synthesis of Pentacyclic 13-Azadibenzo[a,de]anthracenes via Anionic Cascade Ring Closure
摘要:
Bromine-lithium exchange using tert-butyllithium at -78 degreesC initiates a cascade process whereby either xanthone derivatives or pentacyclic 13-azadibenzo[a,de]-anthracenes are produced in high yields. The reaction proceeds via a sequential intramolecular trapping of organolithium intermediates.