Abstract
Organomercurials 2a-c, obtained by the regioselective, Hg(II)-mediated cleavage of cyclopropyl alcohols 1a-c, are converted into the corresponding 5-membered cis-annulated lactones 3a-c via the Pd(II)-catalyzed carbonylation in the presence of p-benzoquinone. Isomeric, trans-fused lactones can be synthesized in a similar way ( 6→7). The carbonylation occurs under an atmospheric pressure of CO.
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