1,4,2-Benzodithiazines reacted with dimethyl acetylenedicarboxylate in boiling o-dichlorobenzene to give 2,3-bis(methoxycarbonyl)-1,4-benzodithiins in good yields with elemination of hydrogen cyanide or a nitrile.
J. Nakayama, H. Fukushima, R. Hashimoto and M. Hoshino, J. Chem. Soc., Chem. Commun., 1982, 612 DOI: 10.1039/C39820000612
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