Synthesis of the ABC Ring System of Azaspiracid. 1. Effect of D Ring Truncation on Bis-spirocyclization†
journal contributionposted on 05.06.2002, 00:00 by Rich G. Carter, T. Campbell Bourland, David E. Graves
Synthesis of a spirocyclization precursor with a truncated D ring has been accomplished. Subsequent bis-spirocyclization induced the formation of equal amounts of the natural transoidal 10R,13R bis-spirocycle and its cisoidal 10R,13S epimer under an apparent thermodynamically controlled process.