Synthesis of 2,2′-Biindolyls; Potential Intermediates for Indolocarbazole Alkaloids

Abstract

Abstract The synthesis of 2,2′-biindolyls oxygenated in the benzenoid ring is reported. Wittig-Horner reaction of the phosphonate esters of 1-benzenesulfonyl-2- bromomethyl-3-substituted indoles with o-nitrobenzaldehydes followed by deoxygenation with triethyl phosphite gave 2,2′-biindolyls.