| abstract |
7-Amino-6-aryl-pyrazolo-(1,5-a)-pyrimidine derivatives (I) are new. Also new are halo-, hydroxy- or dihydroxy-pyrazolopyrimidine derivative intermediates (II). Pyrazolopyrimidines of formula (I) and their acid addition salts (in the case where R1 = amino) are new. R1 = NH2 or OH or alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkenyloxy, alkynyloxy, cycloalkoxy, mono- or dialkylamino, alkenylamino, alkynylamino, cycloalkylamino, N-cycloalkyl-N-alkylamino, alkylideneamino or heterocyclyl (all optionally substituted); R2 = H or alkyl, alkenyl, alkynyl or cycloalkyl (all optionally substituted); or NR1R2 = optionally substituted heterocycle; R3 = optionally substituted aryl; X1 = H or halo; X2 = halo, CN, NO2, haloalkyl, CHO, alkoxycarbonyl, alkylcarbonyl, hydroxyiminoalkyl or alkoxyiminoalkyl. Independent claims are also included for: (1) preparation of (I); (2) new halo-, hydroxy- or dihydroxy-pyrazolopyrimidine derivative intermediates of formula (II); and (3) preparation of (II). Q1 = halo and Q2 = X1; or Q1 = OH and Q2 = H or OH. |