A general strategy for the synthesis of 2,2′-, 2,3′-, and 2,7′-bi-indolyls
Abstract
Various substituted indoles undergo electrophilic substitution with indolin -2-one or 4,6-dimethoxyindolin-2-one and phosphoryl chloride to afford 2,2′-,2,3′-,or2,7′-bi-indolyls, depending on the initial substitution pattern.