Diastereoselective synthesis of 4, 5-dihydrofurans by iodoenolcyclization of 2-allyl-1, 3-dicarbonyl compounds

A study of the stereochem. aspects of I2-induced cyclization of 2-alkenyl- 1,3-dicarbonyl compds., reveals that the iodoenolcyclization is strictly dependent on the dicarbonyl species and the substituents in the allylic position Tetrahedron (), , -