申请人:Mitsui Chemicals, Inc.
公开号:EP1067121A2
公开(公告)日:2001-01-10
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.
式(1)代表的5-氨基吡唑-4-羧酸盐衍生物是由式(2)代表的化合物与式(3)代表的肼化合物或其水合物、盐酸盐、氢溴酸盐或硫酸盐按反应式(C)反应制备的:
其中 R1 是可被卤原子取代的直链或支链 C1 至 C4 烷基,R2 是氢原子、直链或支链 C1 至 C4 烷基或未取代或取代的苯基,R3 是直链或支链 C1 至 C4 烷基,M 是碱金属。
通过本发明的制备工艺得到的 5-氨基吡唑-4-羧酸酯衍生物可用作农用化学品和药物,特别是杀菌剂的中间体。