Cobalt-Mediated [2+2+2] Cycloaddition of Alkynyl Boronates to Indole and Pyrrole Double Bonds

Abstract

The complex [CpCo(C2H4)2] facilitates the [2+2+2] cycloaddn. of borylalkynes to N-(4-pentynoyl)indole and -pyrrole to furnish heterocyclofused borylcyclohexadienes regioselectively.