Abstract
AbstractUnder atmospheric hydrogen pressure, a catalytic amount of palladium(II) trifluoroacetate and (R)‐MeO‐BIPHEP in 2,2,2‐trifluoroethanol promoted the asymmetric hydrogenation of diisopropyl α‐keto phosphonates 1 to afford the corresponding α‐hydroxy phosphonates 2 in excellent yields and with a moderate enantioselectivities of up to 55 % ee. Racemic α‐aryl‐α‐hydroxy phosphonates can be prepared by using palladium on carbon as the catalyst. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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