

THE REACTION OF 1,2-NAPHTHOQUINONE 1-METHIDES WITH SYNCARPIC ACID

Abstract
The reaction of syncarpic acid with Mannich bases derived from 2-naphthol yielded 8,12-dihydro-9H-benzo[a]xanthene-9,11(10H)-diones as products of the Diels–Alder reaction with inverse electron demands involving 1,2-naphthoquinone 1-methides generated in situ and dehydration.
Keywords
8,12-dihydro-9H-benzo[a]xanthene-9,11(10H)-diones; 1,2-naphthoquinone 1-methides; Mannich bases; syncarpic acid; Diels–Alder reaction.
Latvian Institute of Organic Synthesis - Aizkraukles iela, 21, Riga, LV-1006, Latvia - hgs@osi.lv