Diterpenoids. XLVI. Syntheses of Taxodione, Royleanone and Their Analogues

Abstract

Using the readily obtainable 11-nitrophenol 5 prepared by selective nitration of the 12-hydroxy ester 4, syntheses of taxodione (1), royleanone (2) and their analogues (7 and 8) having the methoxy-carbonyl group in place of the 4α-methyl group were accomplished.