Copper-Catalyzed Ring-Opening Radical Trifluoromethylation of Cycloalkanone Oximes
Organic Letters(2019)
摘要
The copper-catalyzed ring-opening C-trifluoromethylation of cycloalkanone oximes with Zn(CF3)2 complexes is described. The reaction proceeds in dichloromethane under mild conditions, providing an efficient and general entry to γ- or δ-CF3-substituted nitriles via tandem N–O and C(sp2)–C(sp3) bond cleavage and C(sp3)–CF3 bond formation. The protocol exhibits a broad substrate scope and wide functional group compatibility. A radical mechanism involving the CF3 transfer from Cu(II)–CF3 complexes to alkyl radicals is proposed.
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关键词
Trifluoromethylation,C–F Bond Activation
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