申请人:NIPPON SODA CO., LTD.
公开号:EP1318145A1
公开(公告)日:2003-06-11
The invention relates to a process (1) for the preparation of 4-cyanoacetylpyrazoles of the general formula [I]
(wherein R1 is C1-6 alkyl; R2 is C1-6 alkyl or C1-6 halo-alkyl; and X is hydrogen or C1-6 alkyl) which comprises using a pyrazolecarboxylic acid halide and a cyanoacetate ester, a process (2) for the preparation of the same which comprises using a pyrazolecarboxylic acid and a cyanoacetate ester, a process (3) for the preparation which comprises using a pyrazolecarbonitrile, and a process (4) for the preparation which comprises using a haloacetylpyrazole. Further, the invention also provides an industrially advantageous process for preparing pyrazolecarboxylic acids useful as intermediates in the above processes.
本发明涉及一种制备4-氰基乙酰吡唑的方法(1),其通式为[I](其中R1为C1-6烷基;R2为C1-6烷基或C1-6卤代烷基;X为氢或C1-6烷基),该方法包括使用吡唑羧酸卤和氰乙酸酯;一种制备相同化合物的方法(2),该方法包括使用吡唑羧酸和氰乙酸酯;一种制备该化合物的方法(3),该方法包括使用吡唑羧腈;以及一种制备该化合物的方法(4),该方法包括使用卤代乙酰吡唑。此外,本发明还提供了一种工业上优越的制备吡唑羧酸的方法,该吡唑羧酸在上述方法中作为中间体使用。