Highly enantioselective [3+3] and [3+4] annulations of isatin-derived enals with ethynylethylene carbonates and ethynyl benzoxazinanones are enabled by NHC/cooper cooperative catalysis, leading to a big library of spirooxindole derivatives in high structural diversity and enantioselectivity (up to 99 % ee). Both reactions represent a nicely synergistic integration of NHC and copper catalysis, in which both catalysts activate the substrates and the chiral NHC perfectly controls the stereochemistry.
机构:
Lanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R China
Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R ChinaLanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R China
Lu Hong
Liu Jin-Yu
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Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R ChinaLanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R China
Liu Jin-Yu
Li Hong-Yu
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Lanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R ChinaLanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R China
Li Hong-Yu
Xu Peng-Fei
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Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R ChinaLanzhou Univ, Sch Life Sci, Inst Microbiol, Lanzhou 730000, Gansu, Peoples R China