Abstract

The synthesis of a new series of diversely N-4 substituted amidines of 2,3-dihydro-1H-1,5-benzodiazepine has been accomplished starting from tetrahydro-1,5-benzodiazepin-2-one derivatives. These compounds were transformed into the desired thiolactams2a–i which reacted in the presence of mercuric chloride with ammonia, as well as primary or secondary amines to give amidines3a–i. Hydrazidines3j–l were prepared by treatment of thiolactams with an excess of hydrazine.

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