Sanchez S, Bateson JH, O'Hanlon PJ, Gallagher T. S-Alkyl Dithioformates as 1,3-Dipolarophiles. Generation of C(2)-Unsubstituted Penems.
Org Lett 2004;
6:2781-3. [PMID:
15281768 DOI:
10.1021/ol048991z]
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Abstract
S-Alkyl dithioformates, generated by a cycloreversion process, react as 1,3-dipolarophiles with beta-lactam-based azomethine ylids to provide, after (net) elimination of MeSH, C(2)-unsubstituted penems. The overall cycloreversion/cycloaddition sequence was accelerated by microwave irradiation. [reaction: see text]
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