Processes for the preparation of pyrazole compounds

    公开(公告)号:AU7776101A

    公开(公告)日:2002-02-25

    申请号:AU7776101

    申请日:2001-08-10

    Applicant: NIPPON SODA CO

    Abstract: The invention relates to a process (1) for the preparation of 4-cyanoacetylpyrazoles of the general formula ÄIÜ (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.

Patent Agency Ranking