Cyanogen condensations as a route to 3-amino-2-imino-1,3-benzothiazin-4-ones with CNS depressant potential.

Seven new 3-amino-2-imino-1,3-benzothiazin-4-ones, prepared from the condensation of cyanogen and 2-mercaptobenzhydrazides, were evaluated in a neuropharmacological mouse profile. CNS depression was observed in several members of the class.