Condensation of 2,6-diarylmethylidenecyclohexa(penta)nones with acetylacetone and ethyl acetoacetate

Abstract

The reactions of symmetrically built diarylmethylidenecyclanones with ethyl acetoacetate and acetylacetone afforded products of carbo-and heterocyclization: hydronaphthalene(indan)ones, cyclopentapyrans, and hexahydrochromenes. The direction of the reaction depends on the size of the ring (С 5 , С 6 ) of the diarylmethylidenecyclanones; the introduction of the electron-withdrawing nitro group into the diarylmethylidene substituent provides a possibility of a targeted reaction yielding the products of О-heterocyclization.