Phthalides 1a–f were treated with prop-2-ynylmagnesium bromide followed by treatment with 20% HCl in one pot to give the corresponding seven-membered cyclic ethers, benzoxepins 4a–f.
Y. Nagao, I. Jeong, W. S. Lee and S. Sano, Chem. Commun., 1996, 19 DOI: 10.1039/CC9960000019
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