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Rhodium-Catalyzed Regioselective Ortho C?H Olefination of 2-Arylindoles via NH-Indole-Directed C?H Bond Cleavage
In the past decades, C?H oxidative olefination of indole at C-2, C-3, C-4 and C-7 positions was well addressed. We report here a rhodium-catalyzed NH-indole-directed ortho C?H bond olefination of 2-arylindoles. This cross-dehydrogenative-coupling proved to be broad in substrate scope, tolerating a variety of functional groups. The synthesis of 6H-isoindolo[2,1-alpha]indoles via rhodium-catalyzed ortho C?H olefination and subsequent intramolecular aza-Michael reaction of 2-arylindoles was also demonstrated. (Figure presented.).
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