Abstract
Optically pure 2-(1-hydroxybenzyl)piperidine and pyrrolidine were prepared by reaction of oxygenated 2-(p -tolylsulfinyl)benzyl carbanions with the appropriate chlorinated N -sulfinylimines followed by subsequent elimination of the sulfinyl groups. The main reaction is a tandem process involving nucleophilic addition of the sulfinylbenzyl carbanion to the C=N bond followed by intramolecular elimination of the chlorine by the resulting amide. The matched pair of the reagents (exhibiting the same configuration at their respective sulfinyl moieties) evolves with a complete control of the stereoselectivity at the two newly created chiral carbons.
Key words
piperidines - pyrrolidines - benzyl carbanion -
N -sulfinylimines - tandem AN /SN i reaction
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