Studies on the Syntheses of Tetracycline Derivatives. II. Thermolytic Cycloaddition of o-Quinodimethanes with Tetrahydronaphthoquinone and Naphthoquinone
Author's Organization:Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University
Tetrahydronaphthoquinone (8) and naphthoquinone reacted with the o-quinodimethanes, generated in situ from the benzocyclobutenes (7) and (14), to give the naphthacene-5, 12-quinone derivatives (9, 15 and 25).