The reactions of N-sulphinylmines with benzoylketen and with 2-carbonyl-1-tetralone (2b), generated in situ via thermolysis of the corresponding furandiones, gave [2 + 4] cycloadducts [1,2,3-oxathiazin-4(3H)-one 2-oxides (3)] in high yields. Similar treatment of di-iminosulphur derivatives with the keten (2b) led to 1-hydroxy-2-naphthamide derivatives as the main products.
T. Minami, Y. Yamauchi, Y. Ohshiro, T. Agawa, S. Murai and N. Sonoda, J. Chem. Soc., Perkin Trans. 1, 1977, 904 DOI: 10.1039/P19770000904
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