Synthesis and oral antiallergic activity of carboxylic acids derived from imidazo2,1-c1,4benzoxazines, imidazo1,2-aquinolines, imidazo1,2-aquinoxalines, imidazo1,2-aquinoxalinones, pyrrolo1,2-aquinoxalinones, pyrrolo2,3-aquinoxalinones, and imidazo2,1-bbenzothiazoles