Citation: Zhu Haiqian, Shang Tianbo, Lu Zenghui, Luo Fang, Zhu Gangguo. Visible-Light Photocatalytic Remote Halo-difluoroalkylation of Thioalkynes[J]. Chinese Journal of Organic Chemistry, ;2020, 40(10): 3410-3419. doi: 10.6023/cjoc202005066 shu

Visible-Light Photocatalytic Remote Halo-difluoroalkylation of Thioalkynes

a.
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004
b.
Wanzhou Ecological Environment Monitoring Station, Chongqing 404000

Corresponding author: Zhu Gangguo, gangguo@zjnu.cn
Received Date: 24 May 2020
Revised Date: 6 June 2020
Available Online: 11 June 2020
Fund Project: the Education Department of Zhejiang Province Y201942955Project supported by the National Natural Science Foundation of China (No. 21672191), the Natural Science Foundation of Zhejiang Province (No. LZ20B020002) and the Education Department of Zhejiang Province (No. Y201942955)the Natural Science Foundation of Zhejiang Province LZ20B020002the National Natural Science Foundation of China 21672191

Figures(4)

Fluoroalkylated alkenes are of significant importance in life sciences and functional materials. The fluoroalkylation of alkynes offers an efficient method for the synthesis of functionalized fluoroalkylated alkenes. However, the current methods are often limited to 1, 2-difunctionalization, while the remote fluoroalkylative difunctionalization of alkynes has been rarely developed. Herein, a novel visible-light-induced remote halo-difluoroalkylation of thioalkynes is realized with difluoroalkyl halides as the radical source, forming distally halogenated (Z)-fluoroalkylated alkenes in moderate to high yields with excellent regio-, stereo-, and site-selectivity. The notable features of this reaction include the mild reaction conditions, broad substrate scope, concurrent formation of three new chemical bonds, and a thermodynamically less stable (Z)-alkene, thus enabling it a highly attractive method for organic synthesis. It represents a new advance on the direct C-H bond halogenation. Preliminary mechanistic studies indicate a cascade radical process involving the heteroatom-induced β-fluoroalkylation of C-C triple bonds, intramolecular 1, 5-hydrogen atom transfer (1, 5-HAT), single electron transfer (SET) oxidation and halide addition.
- difluoroalkyl,
- visible-light photoredox catalysis,
- thioalkyne,
- C-H halogenation,
- radical,
- selectivity
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