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Li, Yang; Pan, Gao-Ang; Luo, Mu-Jia; Li, Jin-Heng
Chemical communications (Cambridge, England), 06/2020, Letnik: 56, Številka: 51Journal Article
The 1, n -enyne annulation reaction has emerged as one of the most powerful and straightforward tools to build carbo- and hetero-cyclic frameworks that are found in numerous natural products, pharmaceuticals and functional materials. Although the 1, n -enyne annulation methods have been well documented to date, there is a tremendous challenge with current methodologies for simultaneously incorporating external functional groups into the resulting cyclic systems. Recent advances in the radical-mediated oxidative 1, n -enyne annulation strategy involving C–H functionalization have been proven to be an ideal alternative to overcome these disadvantages. Such radical-mediated oxidative 1, n -enyne annulation can be accomplished by two different C–H functionalization modes: One proceeds through generation of the carbon-centered radicals from C–H bond direct oxidative cleavage and their subsequent addition across the CC bond or CC bond enabling the 1, n -enyne annulation; the other employs the C–H bonds as the radical acceptors to terminate the initial oxidative radical-triggered annulation of 1, n -enyne. In addition, during many annulation processes the inherent C–H bonds of 1, n -enynes were functionalized. Here, we summarize recent progress in radical-mediated oxidative annulations of 1, n -enynes involving two different conceptual C–H functionalization strategies and the inherent C–H functionalization with an emphasis on the scope, limitations and mechanisms of these different reactions.
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