Rhodium(III)-Catalyzed C–H Alkynylation of Ferrocenes with Hypervalent Iodine Reagents
2017
Wang, Shao-Bo | Gu, Qing | You, Shu-Li
Rapid access to mono- or dialkynylation of ferrocene with ethynylbenziodoxolones as the alkynylation reagents was achieved via rhodium-catalyzed direct C–H bond functionalization at room temperature. Mono- and dialkynylation were easily modulated by varying the sterical volume of the directing group, such as pyridine and isoquinoline, and amount of hypervalent iodine reagents. A wide range of ferrocene-based alkynylation products could be obtained in up to 94% yield, and a gram-scale reaction also proceeded smoothly with high efficiency.
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