A Synthetic Study on Bauhinoxepin J: Construction of a Dibenzo[b,f]oxepin Ring System by a DDQ-Promoted Oxidative Dearomatization–Cyclization Approach

Efforts to construct a dibenzo[b,f]oxepin ring system for a synthesis of bauhinoxepin J are described. A DDQ-promoted oxidative dearomatization-cyclization of the 2-phenoxyethyl-substituted tetramethoxybenzene was used to construct a tricyclic quinone monoacetal.