SYNTHESES OF THE β-ERYTHROIDINE SKELETON

The β-erythroidine skeleton was synthesized by two different routes; one was a four-step synthesis starting from 15, 16, 17-trimethoxy-8-oxo-cise-rythrinan, the other was a five-step synthesis starting from D-furano-8-oxo-cis-erythrinan. The two routes gave the same 14, 17-dihydro-16 (15H) -oxa-erythrinan-8, 15-dione (3).