Reactivity and Diastereoselectivity in Inverse- Type Hetero-Diels-Alder Dihydropyran Syntheses
作者:Satyam Apparao、Martin E. Maier、Richard R. Schmidt
DOI:10.1055/s-1987-28114
日期:——
β-Acyloxy-α-phenylthio-substituted α,β-unsaturated carbonyl compounds 3a-i and 4c, f, having different electron withdrawing carbon substituents at the carbonyl group, afford with ethyl vinyl ether as heterodienophile the dihydropyrans 5a-i and 6c, f, respectively. The endo/exo-diastereoselectivity of these reactions, providing versatile intermediates for carbohydrate and related natural product syntheses, is discussed.