eight- to eleven-membered cyclic ketoethers are synthesized in a single-step by rhodium(II)-catalysed three-carbon ring-enlargement of diazoacetonyl-substituted cyclic ethers via bicyclic ethereal oxonium ylide intermediates.
A. Oku, S. Ohki, T. Yoshida and K. Kimura, Chem. Commun., 1996, 1077 DOI: 10.1039/CC9960001077
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