The synthesis and Diels–Alder reactions of 2-prop-2-enylidene-1,3-dioxolan
Abstract
The synthesis and regiospecific Diels–Alder reactions of 2-prop-2-enylidene-1,3-dioxolan (1) are described. Reactions with 1,4-naphthoquinones (5) gave tetrahydroanthraquinones (6). The adduct of (1) with juglone (5d) could be further hydrolysed to 1,8-dihydroxy-9,10-anthraquinone (7).