[Synthesis of N-(2-carboxy-thieno(2,3-b)pyridin-3-yl)amidines by means of reaction of 4-oxo-4H-pyrido(3',2':4,5)thieno(3,2-d)-1,3-oxazines with primary aliphatic amines].

The title compounds were synthesized by the reaction of tricyclic compounds of structure B with primary aliphatic amines under different conditions and useful isolation methods in good yields. These compounds showed an acceptable antianaphylactic activity.