The reaction of benzamidoxime (1) with chlorine and subsequent reaction with cyanamide (3) gives 5-amino-3-phenyl-1,2,4-oxadiazole (4).[2][3][4] Base catalyzed alkylation with dibutylaminoethyl chloride (5) completes the synthesis of butalamine (6).
References
^Sterne J (April 1976). "[Butalamine hydrochloride. A new vasoactive substance]". Fortschritte Der Medizin (in German). 94 (11): 657–9. PMID823083.
^Aron-samuel Jan Marcel Didier, FR3334M (1965 to Jan Marcel).