Anomalous One-Pot Transformation of 3-Dimethoxymethyl-2-(N-cyanoimino) thiazolidine into 6-Unsubstituted 2,4-Diamino-s-triazines by the Reaction with Amines.

3-Dimethoxymethyl-2-(N-cyanoimino)thiazolidine 1e reacts with secondary amines to afford 2,4-diamino-s-triazines 4 unexpectedly, while the triazine 5 bearing different amino groups at 2 and 4 positions is selectively obtained by the reaction with a mixture of two kinds of amines.