[EN] IMPROVED PROCESS FOR THE PREPARATION OF ESTERS OF 1-H-PYRAZOLE-4-CARBOXYLIC ACIDS<br/>[FR] PROCÉDÉ PERFECTIONNÉ POUR LA PRÉPARATION D'ESTERS D'ACIDES 1H-PYRAZOLE-4-CARBOXYLIQUES
申请人:SOLVAY
公开号:WO2012025469A1
公开(公告)日:2012-03-01
Process for the manufacture of an ester of a 1-H-pyrazole-4-carboxylic acid of formula (I) wherein - R1 is H or an organic residue - R2 is H or an organic residue - R3 is H, an alkyl group having from 1 to 12 carbon atoms, an halogenated alkyl group having from 1 to 12 carbon atoms, an aralkyl group, an aryl group, a halogen. which comprises reacting a compound of formula (II): wherein R4 is C1-C8-alkyl, C3-C8-cycloalkyl, C2-C8-alkenyl, benzyl or phenyl,R1 and R3, are as defined above with a hydrazine of formula (III): R2NHNH2 (III) wherein R2 is as defined above, in the presence of an organic solvent comprising at least one halogen.
制备1-H-吡唑-4-羧酸酯(化学式(I))的方法如下:其中- R1为H或有机残基,- R2为H或有机残基,- R3为H、含有1至12个碳原子的烷基、含有1至12个碳原子的卤代烷基、芳基烷基、芳基、卤素。该方法包括将化合物(II)与化学式(III)的肼在至少含有一种卤素的有机溶剂中反应。其中化合物(II)的化学式为:其中R4为C1-C8-烷基、C3-C8-环烷基、C2-C8-烯基、苄基或苯基,R1和R3如上定义,R2如上定义。