Linclau B, Boydell AJ, Clarke PJ, Horan R, Jacquet C. Efficient desymmetrization of "pseudo"-C2-symmetric substrates: illustration in the synthesis of a disubstituted butenolide from arabitol.
J Org Chem 2003;
68:1821-6. [PMID:
12608797 DOI:
10.1021/jo026696r]
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Abstract
A short synthesis of the homochiral disubstituted butenolide 1 is described in four steps from arabitol. The key steps are the selective kinetic protection of arabitol and the cyclization of 11 to form the butenolide ring. This last transformation represents a rare example of a fully stereoselective cyclitive desymmetrization process of a "pseudo"-C2-symmetric substrate.
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