摘要：

Primary amines cleave s-triazine completely under evolution of ammonia and formation of the corresponding N,N′-disubstituted formamidines. Applied to suitable diamines, this reaction which occurs under mild conditions and with high yields provides a valuable method for the synthesis of various heterocycles, such as imidazolines, tetrahydropyrimidines, purines, benzoxazoles and benzothiazoles.

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