Stereoselective reactions. VIII. Stereochemical requirement for the benzylic oxidation of lignan lactone. A highly selective synthesis of the antitumor lignan lactone steganacin by the oxidation of stegane.

Abstract
A highly efficient synthesis of the antitumor steganin lignan steganacin (1) was accomplished. Bromination of stegane (7) with N-bromosuccinimide followed by treatment with aqueous tetrahydrofuran afforded steganol (3) in 85% yield. Acetylation of 3 gave 1 in 72% yield. Stegane (7) was also oxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in AcOH to give 1 directly in 10% yield. Stereochemical requirements for the benzylic oxidation of dibenzocyclocotadiene liganan lactones are discussed.