申请人:Syngenta Limited
公开号:US07994341B2
公开(公告)日:2011-08-09
The present invention relates to a process for the preparation of compounds of formula (I) wherein R1 and R2 are each independently of the other hydrogen or C1-C5alkyl and R3 is CF3 or CF2H, by a) reaction of a compound of formula (II) wherein R1 and R2 are as defined for formula (I), with at least one reducing agent to form a compound of formula (III) wherein R1 and R2 are as defined for formula (I), and b) reaction of that compound with at least one reducing agent to form a compound of formula (IV) wherein R1 and R2 are as defined for formula (I), and (c) reaction of that compound with a compound of formula (V) wherein Q is chlorine, fluorine, bromine, iodine, hydroxy or C1-C6alkoxy and R3 is as defined for formula (I), to form the compound of formula (I); and to novel intermediates for use in that process.
本发明涉及一种制备式(I)化合物的方法,其中R1和R2各自独立地为氢或C1-C5烷基,R3为CF3或CF2H,所述方法包括:a)用至少一种还原剂反应式(II)化合物,其中R1和R2如式(I)所定义,以形成式(III)化合物,其中R1和R2如式(I)所定义;b)用至少一种还原剂反应该化合物,以形成式(IV)化合物,其中R1和R2如式(I)所定义;c)用式(V)化合物反应该化合物,其中Q为氯、氟、溴、碘、羟基或C1-C6烷氧基,R3如式(I)所定义,以形成式(I)化合物;以及用于该过程的新型中间体。