A Novel Route to Preussomerins via 2-Arylacetal Anions

Abstract
Dimerization of salicylaldehydes provided 6H,12H-6,12-epoxydibenzo[b,f][1,5]dioxocins in multigram quantities. Deprotonation−allylation of the benzylic acetals followed by further functionalization of the diallyl derivative and double Friedel−Crafts cyclization gave a novel preussomerin analogue which possessed the full carbon skeleton of the natural products.