Monoalkyl-substituted thioureas react with dimethyl acetylenedicarboxylate to give, in a good yield, two different dihydrothiazinones, and not one compound only as has been claimed previously. The structures of the adducts were assigned on the basis of i.r. and 1H n.m.r. spectroscopy, and mass spectrometry.
L. I. Giannola, S. Palazzo, P. Agozzino, L. Lamartina and L. Ceraulo, J. Chem. Soc., Perkin Trans. 1, 1978, 1428 DOI: 10.1039/P19780001428
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