发明授权
US08344157B2 Process for preparing 1,3-disubstituted pyrazolecarboxylic esters 失效
1,3-二取代吡唑羧酸酯的制备方法

Process for preparing 1,3-disubstituted pyrazolecarboxylic esters
摘要:
A process for preparing 1,3-disubstituted pyrazolecarboxylic esters of the formula (I) where X, Y, Z=hydrogen or halogen and R1=C1-C6-alkyl, by metering an enol ether of the formula III where R2 is C1-C6-alkyl at from (−41) to (−80)° C. into an alkyl hydrazine of the formula II H2N—NH-lower alkyl   (II).
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