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2004
Enantioselective syntheses
O 0031
Direct Asymmetric Organocatalytic Michael Reactions of α,α-Disubstituted Aldewith β-Nitrostyrenes for the Synthesis of Quaternary Carbon-Containing
47- 028 hydes
Products. — A variety of chiral catalysts are tested for the title reaction (S)-(+)-PDP
in combination with TFA presents an efficient bifunctional system which provides the
α,α-dialkyl Michael products in up to 96% yield with up to 91% e.e. L-Proline reveals
only very poor catalytic activity. — (MASE, N.; THAYUMANAVAN, R.; TANAKA*,
F.; BARBAS, C. F. I.; Org. Lett. 6 (2004) 15, 2527-2530; Dep. Chem., Scripps Res.
Inst., San Diego, La Jolla, CA 92037, USA; Eng.) — Steudel
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