C2-Symmetric Cu(II) Complexes as Chiral Lewis Acids. Catalytic, Enantioselective Cycloadditions of Silyl Ketenes
DA Evans, JM Janey - Organic Letters, 2001 - ACS Publications
C 2-Symmetric bis (oxazoline)− Cu (II) complexes (4a− g) catalyze the enantioselective [2+
2] cycloaddition between (silyl) ketenes and chelating carbonyl substrates. A range of
substituted β-lactones can be produced in excellent yields and selectivities. It was also
found that (trimethylsilyl) ketene (1) may also undergo a highly selective hetero Diels− Alder
reaction with β, γ-unsaturated α-keto esters.
2] cycloaddition between (silyl) ketenes and chelating carbonyl substrates. A range of
substituted β-lactones can be produced in excellent yields and selectivities. It was also
found that (trimethylsilyl) ketene (1) may also undergo a highly selective hetero Diels− Alder
reaction with β, γ-unsaturated α-keto esters.
[引用][C] C2-Symmetric Cu(II) Complexes as Chiral Lewis Acids. Catalytic Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates
DA Evans, T Rovis, MC Kozlowski… - Journal of the American …, 1999 - cir.nii.ac.jp
<i>C</i><sub>2</sub>-Symmetric Cu(II) Complexes as Chiral Lewis Acids. Catalytic
Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates | CiNii Research
… Catalytic Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates …
Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates | CiNii Research
… Catalytic Enantioselective Michael Addition of Silylketene Acetals to Alkylidene Malonates …
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