Copper-catalyzed aerobic oxidative dicarbonylation of indoles utilizing α-carbonyl aldehydes
摘要:
An efficient and practical protocol for copper-catalyzed aerobic oxidative dicarbonylation of indoles using cc-carbonyl aldehydes to construct C-3 indole-substituted 1,2-diketones is developed. Various C-3 indole-substituted 1,2-diketones were observed in good to excellent yields under mild reaction conditions. This transformation used air as an ideal oxidant and produced water as the only by-product. (C) 2015 Elsevier Ltd. All rights reserved.
C-3 dicarbonyl indoles via oxidative cross-coupling of styrenes with indoles under metal-free conditions has been developed. Moreover, a broad scope of C-3 dicarbonyl indoles in moderate to good yields were obtained, and a plausible mechanism is proposed based on control and isotope-labeling experiments. A new and efficient method for the synthesis of C-3 dicarbonyl indoles via oxidative cross-coupling