Treatment of benzothiazole with trimethylsilyl cyanide and an acid chloride in CH2Cl2 gives the N-acyl-2-cyano-2,3-dihydrobenzothiazole in good yield; benzoxazole similarly is converted into a five-membered ring Reissert compound, providing the first examples in these series.
B. C. Uff, S. L. Anne, A. Chen, Y. Ho, F. D. Popp and J. Kant, J. Chem. Soc., Chem. Commun., 1984, 1245 DOI: 10.1039/C39840001245
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