1,4-Cycloaddition reaction of enaminodithiocarboxylate derivatives with dimethyl acetylenedicarboxylate.

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The reaction of enaminodithiocarboxylates, which have a conjugated thiocarbonyldiene system, with dimethyl acetylenedicarboxylate as a dienophile resulted in a 1, 4-cycloaddition to afford various thiapyrane derivatives and spiro (benzothiazoline) and thiazolinecyclopentadiene derivatives by the monodesulfurization. The reaction of thioamide derivatives of lepidine and 4-picoline gave benzoazocine and azocine derivatives.

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