Process for preparing 1-substituted 5- or 3-hydroxypyrazoles

    公开(公告)号:CZ20011713A3

    公开(公告)日:2002-01-16

    申请号:CZ20011713

    申请日:1999-11-06

    Applicant: BASF AG

    Abstract: The invention relates to a process for preparing 1-substituted 5- and/or 3-hydroxypyrazoles of the formulae I and IIin which R1 is C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C3-C6-cycloalkyl or C1-C4-alkoxy, where these groups may be substituted by halogen, C1-C4-alkoxy, phenoxy, C1-C6-alkoxycarbonyl, C1-C6-alkylthiocarbonyl or by a cyclic ring system having 3-14 ring atoms, which comprises reactingan alkyl 3-alkoxyacrylate of the formula IIIin which R2, R3 independently of one another are C1-C6-alkyl or C3-C6-cycloalkyl with a hydrazine of the formula IVin which R1 is as defined abovea) at a pH of 6-11 to give 5-hydroxypyrazoles of the formula I orb) at a pH of 11-14 to give 3-hydroxypyrazoles of the formula II.

    METHOD FOR THE PRODUCTION OF 1-SUBSTITUTED 5-HYDROXYPYRAZOLES

    公开(公告)号:CA2351425A1

    公开(公告)日:2000-06-02

    申请号:CA2351425

    申请日:1999-11-06

    Applicant: BASF AG

    Abstract: The invention relates to a method for the production of 1-substituted 5- hydroxypyrazoles of formula (I) wherein R1 is C1-C6-alkyl, C2-C6-alkenyl, C2 - C6-alkinyl, C3-C6-cycloalkyl or C1-C4-alkoxy, whereby these groups can be substituted by halogen, C1-C4-alkoxy, phenoxy, C1-C6-alkoxycarbonyl, C1-C6- alkylthiocarbonyl or a cyclic ring system with 3-14 ring atoms, by reacting a) an alkylvinylether of general formula (III) wherein R2 is C1-C6-alkyl or C3- C6- cycloalkyl, with phosgene (IVa), "diphosgene" (IVb) or "triphosgene" (IVc) t o form acid chlorides of formula (V), b) transforming said acid chlorides by eliminating hydrogen chloride into the corresponding 3-alkoxyacrylic acid chloride of formula (VI) and c) reacting said acid chloride with hydrazines of formula (VII) wherein R1 has the above cited meaning, to form 5- hydroxypyrazoles of formula (I).

    METHOD FOR PRODUCING 1-SUBSTITUTED 5- OR 3-HYDROXYPYRAZOLES

    公开(公告)号:CA2351370A1

    公开(公告)日:2000-06-02

    申请号:CA2351370

    申请日:1999-11-06

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing 1-substituted 5- and/or 3- hydroxypyrazoles of formulas (I) and (II), wherein R1 represents C1-C6-alkyl , C2-C6-alkenyl, C2-C6-alkinyl, C3-C6-cycloalkyl or C1-C4-alkoxy, whereby thes e groups can be substituted by halogen, C1-C4-alkoxy, phenoxy, C1-C6- alkoxycarbonyl, C1-C6-alkylthiocarbonyl or a cyclic ring system with 3-14 ri ng atoms, by reacting a 3-alkoxyacrylic acid alkyl ester of formula (III), wherein R2, R3 independently mean C1-C6-alkyl or C3-C6-cycloalky, with a hydrazine of formula (IV), wherein R1 has the above cited meaning, a) at a p H value of 6-11 to form 5-hydroxypyrazoles of formula (I), or b) at a pH value of 11-14 to form 3-hydroxypyrazoles of formula (II).

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