申请人:BASF Aktiengesellschaft
公开号:US06329530B1
公开(公告)日:2001-12-11
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) to 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).
本发明涉及一种制备式(I)的1-取代5-羟基吡唑的方法,其中R1为C1-C6烷基,C2-C6烯基,C2-C6炔基,C3-C6环烷基或C1-C4烷氧基,这些基团可以被卤素,C1-C4烷氧基,苯氧基,C1-C6烷氧羰基,C1-C6烷基硫酰基或具有3-14个环原子的环状环系所取代,通过反应a)通式(III)的烷基乙烯醚,其中R2为C1-C6烷基或C3-C6环烷基,与光气(IVa),“二光气”(IVb)或“三光气”(IVc)反应形成酸氯化物式(V),b)通过消除氯化氢转化所述酸氯化物为相应的3-烷氧基丙烯酸氯化物式(VI),并c)将所述酸氯化物与通式(VII)的肼反应,其中R1具有上述意义,以形成式(I)的5-羟基吡唑。