Homochiral α‐dibenzylamino aldehydes react with 4‐butenylmagnesium bromide in diethyl ether at 0 °C to yield anti‐β‐amino alcohols in excellent yield and dr. These anti diastereoisomers were transformed into enantioenriched 2‐ and 2,6‐substituted 3‐piperidinols in good yields. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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Andrés et al. (2007) studied this question.
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