1,2,3,4-TETRAHYDRO-PYRAZO 5,1-C1,2,4 TRIAZINES, PHARMACEUTICAL COMPOSITIONS CONTAINING THEM AND PROCESS FOR PREPARING THEM

摘要

PCT No. PCT/JP94/00213 Sec. 371 Date Aug. 21, 1995 Sec. 102(e) Date Aug. 21, 1995 PCT Filed Feb. 9, 1994 PCT Pub. No. WO94/19350 PCT Pub. Date Sep. 1, 1994New heterocyclic derivatives of the formula: able substituent(s) or heterocyclic group which may have suitable substituent(s), R2 is aryl which may have suitable substituent(s) or heterocyclic group which may have suitable substituent(s), R3 is hydrogen or acyl, R4 is hydrogen, lower alkyl, cyclo(lower)alkyl, cyclo(lower)alkyl-(lower)alkyl, carboxy(lower)alkyl, protected carboxy(lower)alkyl, ar(lower)alkyl which may have suitable substituent(s), ar(lower)alkenyl, bridged tricyclicalkyl, heterocyclic group which may have suitable substituent(s), acyl, or a group of the formula IMAGE (in which A is lower alkylene), and R5 is hydrogen or lower alkyl, and a pharmaceutically acceptable salt thereof which are useful as a medicament.