Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (7): 1003-1019.DOI: 10.1016/S1872-2067(19)63278-X

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Visible light promoted difunctionalization reactions of alkynes

Xiang Ren, Zhan Lu   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2018-11-18 Revised:2018-12-08 Online:2019-07-18 Published:2019-05-24
  • Supported by:

    This work was supported by Zhejiang Provincial Natural Science Foundation of China (LR19B020001), the National Natural Science Foundation of China (21472162, 21772171), and the National Basic Research Program of China (2015CB856600).

Abstract:

Visible light promoted difunctionalization of alkynes is reviewed. The difunctionalization reaction is achieved by different reagents. Radicals such as carbon (sp3), carbon (sp2), and other heteroatom (P, S, N, Se, O, and halide) radicals initiated by visible light can undergo radical addition to a carbon-carbon triple bond. Upon further transformation, the desired difunctionalized products are obtained. Some organometallic complexes can be activated by visible light; the difunctionalization of alkynes is catalyzed by these species. Other reagents like 1,3-dipole precursors could also react with alkynes to give difunctionalization products; here, the 1,3-dipole derivatives are obtained by visible light photocatalysis. So far, the strategy has been succeeded in the formation of C-C bonds and C-X bonds. Several valuable chemical skeletons have been constructed under mild conditions. However, high regio-and stereoselectivities in some direct difunctionalization methodologies are yet to be achieved.

Key words: Visible light photocatalysis, Difunctionalization, Cyclization, Alkyne, Redox catalyst