Evans DA, Wu J, Masse CE, MacMillan DWC. A general method for the enantioselective synthesis of pantolactone derivatives.
Org Lett 2002;
4:3379-82. [PMID:
12323023 DOI:
10.1021/ol026489d]
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Abstract
An efficient enantioselective synthesis of beta,beta-dialkyl-gamma-substituted pantolactones has been achieved utilizing the cationic [Sc((S,S)-R-pybox)](Cl)(2)(+), R = Ph (9), t-Bu (10), complex in a catalyzed aldol reaction as the key step. The pantolactone derivatives are isolated in high enantiomeric excesses. [reaction: see text]
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