Abstract
The (S)-sulfide 6 has been synthesized as a synthetic equivalent of novel 3-piperidinol N-α-carbanion B via deprotonation and lithium naphthanelide (LN)-mediated reductive lithiation. The reaction of the 3-piperidinol N-α-carbanion intermediate B with carbonyl compounds gave, besides some reduced product 2a, the desired α-hydroxyalkylation products 12–17 with excellent 2,3-diastereoselectivity. The reductive α-hydroxyalkylation with unsymmetric carbonyl compounds led to only 50:50 to 77:23 diastereoselectivities at the C-1′ carbinol center.
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Supported by the National Natural Science Foundation of China (Grant No. 20832005).
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Zheng, X., Chen, G., Ruan, Y. et al. Generation and α-hydroxyalkylation of a novel 3-piperidinol N-α-carbanion intermediate. Sci. China Ser. B-Chem. 52, 1631–1638 (2009). https://doi.org/10.1007/s11426-009-0229-2
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DOI: https://doi.org/10.1007/s11426-009-0229-2