AN EXPEDIENT PREPARATION OF CHIRAL BUILDING-BLOCKS HAVING LEVOGLUCOSENONE CHROMOPHORE - A NEW ENANTIOCONTROLLED ROUTE TO (-)-BETA-MULTISTRIATIN AND (-EXO-BREVICOMIN())

2-Alkenylfurans are transformed enantioselectively into the bicyclic e nones having the levoglucosenone chromophore, whose synthetic utility is demonstrated by a stereocontrolled synthesis of two insect pheromon es (-)-beta-multistriatin and (+)-exo-brevicomin.