Both enantiomers of 3‐hydroxy‐2‐methylpropanoic acid tert‐butyl ester were prepared with high enantioselectivity (up to 94 %) through a ruthenium‐SYNPHOS®‐promoted asymmetric hydrogenation reaction using an atom‐economic transformation from simple and inexpensive precursors.
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Jeulin et al. (2007) studied this question.
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