Tetrahydrodibenzo-p-dioxins from ethyl 1,4-benzodioxan-2-carboxylate and ethyl acetoacetate
Abstract
Reaction of the sodium enolate of ethyl acetoacetate with ethyl 1,4-benzodioxan-2-carboxylate gives ethyl 3,4,4a,10a-tetrahydro-2,10a-dihydroxydibenzo-p-dioxin-1-carboxylate and 4,4a-dihydrodibenzo-p-dioxin-2(3H)-one in small yield. A mechanism is proposed.