Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 79, Issue 6, Pages 2514-2521Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo402802j
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Funding
- Research Council of Norway [209330]
- Norwegian Research Council through the CoE, Centre for Theoretical and Computational Chemistry [179568/V30]
- CNRS
- Ministere de l'Enseignement Superieur et de la Recherche
- Norwegian Supercomputing Program (NOTUR) [NN4654K]
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The asymmetric nucleophilic 1,2-addition of (S)-N-benzylidene-2-methylpropane-2-sulfinamide with methyl-magnesium bromide and methyllithium has been investigated using DFT(B3LYP) computations. The calculated ratio of the two diastereomers agrees with experimental observations, and the factors that determine the diastereomeric ratio are discussed. The preference for the E isomer and the rapid equilibrium between the E and Z isomers of N-tert-butanesulfinyl imine are two key features for understanding the mechanism of this reaction. Methylmagnesium bromide and methyllithium have bifunctional roles, acting as both Lewis acid and nucleophile, and the Lewis acid character plays a determining role in the stereoselectivity of the reaction.
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