Cobalt(ii)/(imidazoline–oxazoline)-catalyzed enantioselective Michael addition of 2-acetyl azaarenes to β-CF3-β-disubstituted nitroalkenes
Literature Information
Xin-Qi Hao, Cong Wang, Shuang-Liang Liu, Xiao Wang, Li Wang, Jun-Fang Gong, Mao-Ping Song
A series of chiral (imidazoline–oxazoline) N,N-bidentate ligands L1–L5 derived from 2,2-dimethylmalonic acid were conveniently synthesized and characterized. With the aid of the new ligands, the first Co(II)-catalyzed asymmetric Michael addition of 2-acetyl azaarenes to β-CF3-β-disubstituted nitroalkenes was successfully achieved, producing chiral compounds with a trifluoromethylated all-carbon quaternary stereocenter in good yields with enantioselectivities of up to 98% ee.
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