A 5-aminopyrazole-4-carboxylate derivative represented by the formula (1) is prepared by reacting a compound represented by the formula (2) with a hydrazine compound represented by the formula (3) or hydrate, hydrochloride, hydrobromide or sulfate of the same according to the reaction formula (C):
wherein R1 is a straight or branched C1 to C4 alkyl group which can be substituted with a halogen atom, R2 is a hydrogen atom, straight or branched C1 to C4 alkyl group or an unsubstituted or substituted phenyl group, and R3 is a straight or branched C1 to C4 alkyl group, and M is an alkali metal.
The 5-aminopyrazole-4-carboxylate derivative obtained by the preparation process of the invention is useful for an intermediate of agricultural chemicals and medicines, fungicides in particular.
通过反应式(C)的反应,将式(2)所代表的化合物与式(3)或其
水合物、盐(如盐酸盐、
溴化物盐或
硫酸盐)所代表的
肼化合物反应,制备出式(1)所代表的5-
氨基
吡唑-4-羧酸衍
生物。其中,R1为直链或支链的C1到C4烷基,可被卤素原子取代;R2为氢原子、直链或支链的C1到C4烷基或未取代或取代的苯基;R3为直链或支链的C1到C4烷基;M为碱
金属。本发明制备过程得到的5-
氨基
吡唑-4-羧酸衍
生物可用作农药和药物的中间体,特别是杀菌剂。