Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 77, Issue 16, Pages 6959-6969Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo301149s
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Funding
- DST (New Delhi)
- Council of Scientific and Industrial Research (CSIR, New Delhi)
- DST
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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.
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