Schwan AL, Verdu MJ, Singh SP, O'Donnell JS, Ahmadi AN. Diastereoselective alkylations of a protected cysteinesulfenate.
J Org Chem 2009;
74:6851-4. [PMID:
19711997 DOI:
10.1021/jo901021r]
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Abstract
To further understand stereoselection in the alkylation of sulfenate anions, a protected cysteinesulfenate was generated in THF solution at low temperature. Introduction of a reactive alkylating agent brings about a cysteinyl sulfoxide in 51-75% yield, with diastereomeric ratios at the sulfinyl group ranging from 83:17 to 95:5. An internally complexed lithium counterion is proposed to account for the stereoselectivity.
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