Wagner-Meerwein rearrangement of steviol 16α,17- and 15α,16-epoxides
摘要:
16 alpha,17- and 15 alpha,16-Epoxy derivatives of diterpenoid steviol having ent-kaurane structure were found for the first time to undergo Wagner-Meerwein rearrangement in alkaline medium or by the action of boron trifluoride-diethyl ether complex to give products with ent-beyerane structure. The geometric parameters of steviol 16 alpha,17- and 15 alpha,16-epoxides were determined by X-ray analysis.