Abstract
Ketene-S, N-acetals reacted with isothiocyanates to give β-aminothiocarbonyl-α-methylthioen-amines, which were transformed into enaminonitriles by carbon-carbon bond formation with malononitriles. Treatment of the enaminonitriles with base afforded pyridine-2-thiones. In addition, bis-lithio-ketene-S, N-acetals, generated from the enaminonitriles and n-BuLi, reacted with alkyl halides to give 3-alkylpyridine-2-thiones.
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