Y. Alabed et al., STEREOSELECTIVE SYNTHESIS OF BETA-OXY-GAMMA-BUTYROLACTONES AND ALPHA-METHYLENE-GAMMA-BUTYROLACTONES ON PYRANOSE TEMPLATES, Tetrahedron, 49(41), 1993, pp. 9295-9306
Reaction of sugar derived epoxy triflates 1 and 2 or epoxy ketoses 11
and 12 with ester or acid enolates followed by acid-catalyzed ring clo
sure affords poly-substituted chiral butenolides in excellent yields.