摘要:
A practical protecting group free synthesis of Hagen's gland lactones 1 and 2 is accomplished in four steps and 25.6 and 37.4% overall yields, respectively. The strategy relies on a one-pot conversion of D-glucono-delta-lactone to beta-hydroxy-gamma-vinyl-gamma-lactone, cross-metathesis, and iodocyclization-deiodinization as key steps.