Synthesis of bicyclic α-methylene-γ-lactones involving stereocontrolled introduction of an homoallylic acyloxy group
Abstract
Syntheses of 6-endo-(VI) and 6-exo-acetoxy-4-methylene-2-oxabicyclo[3.3.0]oct-7-en-3-one (XI) from readily available bromolactones (I) and (VII) have been accomplished through formation and dehydrohalogenation of intermediate iodoacetates.