Asymmetric reductions of α-keto acetals using various oxazaborolidines and borane reagents as catalyst and the hydride source, respectively, were compared. The reduction catalyzed by Corey’s CBS reagents with N-phenylamine–borane reagents provided α-hydroxy acetals with very high enantioselectivities for most aromatic analogues.
B. Tae Cho and Y. Sung Chun, J. Chem. Soc., Perkin Trans. 1, 1999, 2095 DOI: 10.1039/A903335A
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