Thermal 1,6‐Electrocyclization Reactions of Acceptor‐Substituted 2,3‐Divinyl‐1 H ‐indoles Yielding Functionalized Carbazoles

Three new synthetic procedures for and thermal 1,6‐electrocyclizations of acceptor‐substituted 2,3‐divinyl‐1 H ‐indoles leading to functionalizing carbazoles are described. The scope and limitations as well as some mechanistic aspects of the methodologies are discussed. The key strategies employed include Pd(II)‐catalyzed coupling and Wittig procedures.