Phosphine Catalyzed [3+2] Cycloaddition and Vinylation of Indole‐derived α,α‐Dicyanoolefins with γ‐Substituted Allenoates

A phosphine-catalyzed [3+2] cycloaddition of gamma-substituted allenoates with alpha,alpha-dicyanoolefins has been established, affording indole-incorporated highly functionalized cyclopentenes. In addition, the vinylation of indole-derived alpha,alpha-dicyanoolefins has also been realized under the same reaction conditions by switching to indole-derived alpha,alpha-dicyanoolefins without protective group at N-1 position.