Pyrazolo1,5-cquinazoline derivatives and related compounds

Abstract From the Canadian patent

QA92, Abstract, Compounds are provided having the structure wherein R1 and R2 may be the same or different and R1 is hydrogen, alkyl of 1-3 carbons, phenyl optionally substituted by R4 or , ; R2 is , hydrogen, lower alkyl or phenyl optionally substituted by R4 with the proviso that at least one of R1 and R2 is ; R3 is hydrogen, lower alkyl, benzyl or phenyl optionally substituted by R4; and R4 and R5 are the same or different and represent hydrogen lower alkyl, lower, alkoxy, alkanoyloxy benzyloxy, hydroxy, halogen (Cl, Br and F) nitro and trifluoromethyl; R6 is hydrogen lower alkyl, alkanoyl, aroyl, aralkanoyl aralkyl or phenyl; and R7, R8, m and n are as defined hereinafter. The compounds …