From the cycloaddition of benzothiazole to dimethyl acetylenedicarboxylate, an abnormal addition product, dimethyl 4-formyl-2,3di-hydrobenzothiazine-2,3-dicarboxylate, was obtained; the structure of this compound was confirmed by an X-ray analysis.
H. Ogura, H. Takayanagi, K. Furuhata and Y. Iitaka, J. Chem. Soc., Chem. Commun., 1974, 759a DOI: 10.1039/C3974000759A
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