The present invention relates to a process for preparing an N-substituted 1 H-pyrazole- 5- carboxylate compound of the formula (l-A) comprising the steps of i) deprotonating a compound of the formula (II) in which the variables R1, R2 and r are each as defined in the description and the claims, with a magnesium-organic base having a carbon bound magnesium; and ii) subjecting the product obtained in step (i) to a carbonylation by reacting it with a reagent selected from the group consisting carbon dioxide or a carbon dioxide equivalent, to obtain a compound of formula (l-A); and it relates to further conversions to yield a N-substituted 1H-pyrazole-5-carbonyl chloride compound of the formula (I).
本发明涉及一种制备式(l-A)的N-取代1 H-
吡唑-5-羧酸酯化合物的过程,包括以下步骤:i) 用具有碳键
镁的
镁有机碱去质子化式(II)的化合物,其中变量R1、R2和r如描述和索赔中定义,并ii) 将步骤(i)中得到的产物经过羰基化反应,与选择自
二氧化碳或
二氧化碳等效物的试剂反应,得到式(l-A)的化合物;并且涉及进一步的转化以产生式(I)的N-取代1H-
吡唑-5-羰基
氯化物化合物。