2,2′-Biindolyl revisited. Synthesis and reactions

Abstract

An improved synthesis of 2,2′-biindolyl ( 1) is described. Derivatives of 1 with a variety of substituents in the 3,3′-positions, such as the 3,3′-diformyl derivative 19 have been synthesized. Potential syntheses of indolocarbazole alkaloids from such derivatives are outlined.