Synthesis of trisphaeridine and norchelerythrine through palladium-catalyzed aryl–aryl coupling reactions
Abstract
Total syntheses of trisphaeridine (3) and norchelerythrine (4), fully aromatized phenanthridine and benzo[c]phenanthridine alkaloids, were accomplished via the internal aryl–aryl coupling reaction of halo amides protected by a methoxymethyl group with the palladium reagent, followed by reduction with lithium aluminium hydride and treatment with hydrochloric acid.