Photoinduced Nickel-Catalyzed Deaminative Cross-Electrophile Coupling for C(sp 2 )–C(sp 3 ) and C(sp 3 )–C(sp 3 ) Bond Formation

作者：Tao Yang, Yi Wei, Ming Joo Koh · 发表于：ACS Catalysis · 年份：2021 · DOI：10.1021/acscatal.1c01416 · 被引用次数：77 · 研究领域：Radical Photochemical Reactions、Catalytic C–H Functionalization Methods、Catalytic Cross-Coupling Reactions

The construction of C–C bonds through cross-coupling between two electrophiles in the absence of excess metallic reducing agents is a desirable objective in chemistry. Here, we show that N -alkylpyridinium salts can be efficiently merged with aryl or alkyl halides in an intermolecular fashion, affording products in up to 92% yield at ambient temperature. These reactions harness the ability of N -alkylpyridinium salts to form electron donor–acceptor complexes with Hantzsch esters, enabling photoinduced single-electron transfer and fragmentation to afford alkyl radicals that are subsequently trapped by a Ni-based catalytic species to promote C(sp 2 )–C(sp 3 ) and C(sp 3 )–C(sp 3 ) bond formation. The operationally simple protocol is applicable to site-selective cross-coupling and tolerates diverse functional groups, including those that are sensitive toward metal reductants.