esters and -3-carbonitriles. The structure of the obtained pyrrolobenzothiazine derivatives was confirmed unambiguously by X-raycrystallographic study. Reaction of these pyrrolo[2,1-b][1,3]benzothiazines with aliphatic primary amines resulted in the thiazine ring cleavage and formation of 2-[(5-aroyl-3-cyano(or ethoxycarbonyl)-1H-pyrrol-2-yl)thio]-N-alkylbenzamides.