Single and double asymmetric inductions were achieved by the reduction of pyruvates and benzoylformates with 2,6-dimethyl-3,5-dialkoxycarbonyl-1,4-dihydropyridine in the presence of a mono-ionised zinc species; differentiation is made between enantiotopic faces of the substrate carbonyl by diastereotopic hydrogen, and between diastereotopic faces by equivalent and diastereotopic hydrogen.
K. Nishiyama, N. Baba, J. Oda and Y. Inouye, J. Chem. Soc., Chem. Commun., 1976, 101 DOI: 10.1039/C39760000101
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