Abstract
Abstractmagnified image[2‐Alkylthio‐6‐methyl‐4‐oxopyrimidin‐3(4H)‐yl]acetonitriles (3‐5) treated with sodium methoxide in methanol followed by ammonium chloride were cyclized to 2‐imino‐7‐methyl‐2,3‐dihydroimidazo[1,2‐a]‐pyrimidin‐5(1H)‐ones (6‐8). Under acid or base‐catalyzed hydrolysis they were converted to 7‐methyl‐imidazo[1,2‐a]pyrimidine‐2,5‐[1H,3H]‐diones (9‐11), whereas in the reaction with butyl‐ or benzylamine the corresponding 7‐methyl‐2‐(substitutedamino)imidazo[1,2‐a]pyrimidin‐5(3H)‐ones (13‐18) were produced. The latter were found to exist in two tautomeric forms in CDCl3 solution.
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