1393366-08-9Relevant articles and documents
Palladium-catalyzed annulation of allenes with indole-2-carboxylic acid derivatives: Synthesis of Indolo[2,3-c]pyrane-1-ones via Ar-I Reactivity or C-H functionalization
Suresh, R. Rama,Swamy, K. C. Kumara
experimental part, p. 6959 - 6969 (2012/09/25)
Two methodologies, one involving Ar-I reactivity and the other through C-H functionalization, for the formation of indolo[2,3-c]pyrane-1-ones via the corresponding allenes, are presented. A highly efficient approach to indolo[2,3-c]pyrane-1-one derivatives through the Pd-catalyzed regioselective annulation of allenes with 3-iodo-1-alkylindole-2-carboxylic acids is described. This method is fairly general for a wide range of allenes affording the respective indolo[2,3-c]pyrane-1-ones in good to excellent yields. In addition, a Pd(II)-catalyzed oxidative coupling of indole-2-caboxylic acid derivatives with allenes via direct C-H functionalization to afford the corresponding indolo[2,3-c]pyrane-1-ones in moderate to good yields has been developed.