Diels–Alder cycloaddition reactions of methyl 2-methylthiopenta-2,4-dienoate: a gem- captodative diene reacting as dienophile by its terminal double bond
Abstract
The captodative diene methyl 2-methylthiopenta-2,4-dienoate (1) reacts cleanly as a dienophile, at the less substituted double-bond, in Diels–Alder cycloaddition reactions with unactivated conjugated dienes.