The reaction of the transient furoisoxazole 4 with dimethyl acetylenedicarboxylate results in the formation of oxepine 9k. The boat-shaped structure of 9k has been confirmed by X-ray crystallography. The experimental findings are in accord with quantum chemical calculations (AM1, PM3).
Jones, Raymond C. F.; Bhalay, Gurdip; Carter, Paul A., Journal of the Chemical Society. Perkin transactions I, 1999, # 7, p. 765 - 776
作者:Jones, Raymond C. F.、Bhalay, Gurdip、Carter, Paul A.、Duller, Kathryn A. M.、Dunn, Stephen H.
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Kholy, Y. M. El, Egyptian Journal of Chemistry, 1996, vol. 39, # 3, p. 249 - 258