Synthesis of tridensone, a sesquiterpene ketone isolated from the liverwort Bazzania tridens. Structure revision and absolute configuration

Abstract

The title compound and its isomer have been synthesized as optically active forms. The spectral data of the natural compound 1 were identical with those of our synthetic isomer 1 a showing that its structure should be revised and its absolute configuration was established as an antipode of the synthetic one as depicted in the formula 9.