Disclosed is a process for preparing a 3-hydroxy-7-mercaptopyrazolo[4,3-d]pyrimidine compound represented by the general formula (IX):
 wherein R¹ is a hydrogen atom, an alkyl group having l to 4 carbon atoms, a phenyl group or a substituted phenyl group, which comprises:
    from a pyrazole compound represented by the general formula (III):
 wherein R¹ is the same as defined above.
Also disclosed are pyrazole compounds represented by the general formula (I):
  wherein:
    R¹ is a hydrogen atom, an alkyl group having l to 4 carbon atom, a phenyl group or a substituted phenyl group:
    X is a nitroso group, an amino group or (R²)₂NCH=N- (wherein R² is an alkyl group having l to 3 carbon atoms): and
    Y is -C(O)NH₂ when R¹ is an alkyl group having l to 4 carbon atoms, a phenyl group or a substituted phenyl group and X is a nitroso group, or -C(O)NH₂ when R¹ is a hydrogen atom, an alkyl group having l to 4 carbon atoms, a phenyl group or a substituted phenyl group and X is an amino group, or CN or -C(S)NH₂ when R¹ is a hydrogen atom, an alkyl group having l to 4 carbon atoms, a phenyl group or a substituted phenyl group and X is (R²)₂NCH=N- (wherein R² is the same as defined above. The compounds serve as intermediate for preparing the compound of the formula (IX).  
                            本发明公开了一种制备通式(IX)代表的 3-羟基-7-巯基
吡唑并[4,3-d]
嘧啶化合物的工艺:
 其中 R¹ 是氢原子、具有 l 至 4 个碳原子的烷基、苯基或取代的苯基,其包括
由通式(III)代表的
吡唑化合物:
 其中 R¹ 与上述定义相同。
还公开了通式(I)所代表的
吡唑化合物:
  其中
R¹ 是氢原子、具有 l 至 4 个碳原子的烷基、苯基或取代苯基:
X 是亚硝基、
氨基或 (R²)₂NCH=N-(其中 R² 是具有 l 至 3 个碳原子的烷基):以及
当 R¹ 为具有 l 至 4 个碳原子的烷基、苯基或取代苯基且 X 为亚硝基时,Y 为-C(O)NH₂;或当 R¹ 为氢原子、具有 l 至 4 个碳原子的烷基、苯基或取代苯基且 X 为亚硝基时,Y 为-C(O)NH₂、当 R¹ 为氢原子、l 至 4 个碳原子的烷基、苯基或取代苯基且 X 为 (R²)₂NCH=N- 时,则为 CN 或 -C(S)NH₂(其中 R² 与上述定义相同)。这些化合物可作为制备式(IX)化合物的中间体。