PYRAZOLO(4,3-D)PYRIMIDINE DERIVATIVE, PROCESS FOR ITS PRODUCTION, ANTIHYPERLIPIDEMIC AGENT CONTAINING IT, ITS INTERMEDIATE AND PROCESS FOR THE PRODUCTION OF THE INTERMEDIATE

摘要

A pyrazolo¢4,3-d!pyrimidine derivative having the formula: (I) wherein R1 is lower alkyl or phenyl, R2 is -A-CO2R21 (wherein A is alkylene having from 1 to 3 carbon atoms which is unsubstituted or substituted by methyl, and R21 is lower alkyl having from 1 to 4 carbon atoms), -CH2CO-phenyl, a saturated or unsaturated, straight-chain or branched aliphatic group having from 3 to 16 carbon atoms, phenyl-lower alkyl, -CH2CN, chloro substituted phenyl-lower alkyl, or (wherein R22 is hydrogen or lower alkyl), and R3 is a saturated or unsaturated, straight chain or branched aliphatic group having from 2 to 22 carbon atoms, phenyl-lower alkyl, benzyloxy substituted phenyl-lower alkyl, unsubstituted or lower alkyl substituted phenyl-methyloxyethyl, cyclohexyl-cyclohexyl, methylcyclohexyl, 3-thia-n-heptyl (or 2-n-butylthioethyl) 3,6dioxadecyl, 4-oxo-n-pentyl, or 2-hydroxethyl.