Reaction of nitriles under acidic conditions. Part <b>VII</b>. Study on the reaction of <i>o</i>‐aminonitriles with cyanamides to synthesize 2,4‐diaminothieno[2,3‐<i>d</i>]pyrimidines

Abstract

Abstract The reaction of N ‐arylcyanamides with thiophene o ‐aminonitriles under the influence of dry hydrogen chloride gas yields a mixture of two products. The major product has been identified as 2‐amino‐3‐aryl‐4‐iminothieno[2,3‐ d ]pyrimidine and the minor as 2‐amino‐3‐arylthieno[2,3‐ H ]pyrimidin‐4(3 H )‐one.