Shing TKM, Wong WF, Cheng HM, Kwok WS, So KH. Intramolecular Nitrile Oxide−Alkene Cycloaddition of Sugar Derivatives with Unmasked Hydroxyl Group(s).
Org Lett 2007;
9:753-6. [PMID:
17263540 DOI:
10.1021/ol062873p]
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Abstract
[reaction: see text] Intramolecular nitrile oxide-alkene cycloaddition (INOC) of sugar derivatives with one to four free hydroxyl group(s) is reported. The INOC reaction, using chloramine-T, in the presence of silica gel, to generate nitrile oxides from oximes, proceeded smoothly to afford five- or six-membered carbocycles in good to excellent yields. This new methodology alleviates protection/deprotection steps and makes the synthetic route shorter and more efficient.
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