The Exocyclic Olefin Geometry Control via Ireland—Claisen Rearrangement: Stereoselective Total Syntheses of Barmumycin (V) and Limazepine E (VI)

Abstract

The highly selective Ireland—Claisen rearrangement of seven-membered lactone-derived boron enolate generated in situ is the key step to synthesize the naturally occurring antitumor agents (V) and (VI)