Formation of 2,3-bis(methoxycarbonyl)-1,4-benzodithiins by reaction of 1,4,2-benzodithiazines with dimethyl acetylenedicarboxylate

Abstract
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.

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