Diels–Alder reactions of methyl coumalate with 1,3-dienes
Abstract
Diels–Alder reaction of methyl coumalate (Ib) with 1,3-dienes afforded the tetrahydrocoumarin (IV) and/or the tricyclo[3,2,1,02,7]oct-3-ene (V) in which the reaction giving (IV) is the first example of the reaction of a 2-pyrone as a dienophile.