Dr. Olga García Mancheño, Pia Tangen, Renate Rohlmann, Roland Fröhlich and Dr. José Alemán Synthesis of Chiral Cyclic Nitrones by Asymmetric Addition of β-Ketosulfones to Nitroalkenes followed by Reductive Cyclization Chemistry - A European Journal 17
An addition to the family: Thiourea cinchona alkaloids catalyze the addition of β-ketosulfones to nitroalkenes. The readily obtained addition products can be selectively transformed into chiral nitrones by reduction of the nitro group and cyclization in situ (up to 99:1 e.r. and >98:2 d.r.; see scheme).
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