[EN] PREPARATION OF 6-HALO-2-(HALOALKYL)-3-ACYLPYRIDINES AND INTERMEDIATES THEREFOR<br/>[FR] PRÉPARATION DE 6-HALO-2-(HALOALKYL)-3-ACYLPYRIDINES ET INTERMÉDIAIRES CORRESPONDANTS
申请人:BAYER AG
公开号:WO2020120284A1
公开(公告)日:2020-06-18
The present invention relates to a process for preparing compounds of formula (I) wherein R represents C1-C2-alkyl and X represents chlorine or bromine, by reacting a compound of formula (II) wherein R is defined as in formula (I), in a first step A) with a dehydroxyhalogenation agent selected from COCl2, diphosgene, triphosgene, cyanuric chloride, SOCI2, SO2CI2, PCI3, PCI5, POCI3, PBr3, SOBr2 and SO2Br2 to arrive at a compound of formula (III) wherein X and R are defined as in formula (I), and the compound of formula (III) is reacted in step B) with a malonate of formula (IV) wherein R1 represents C1-C6-alkyl, C2-C6, -alkenyl. C2-C6-alkynyl, C3-C8-cycloalkyl or benzyl; in presence of a base and a magnesium compound to arrive at a compound of formula (V) wherein X and R are defined as in formula (I); and R1 is defined as in formula (IV); and decarboxylating the compound of formula (V). Optionally the resulting compound of formula (I) is further reacted to a triazole derivative of formula (VIII). It further relates to the compounds of formula (V).
本发明涉及一种制备化合物的方法,其中化合物的结构式为(I),其中R代表C1-C2-烷基,X代表氯或溴,通过将结构式为(II)的化合物与第一步A)中选择的脱羟卤代剂如COCl2,二氯代磷酸酯,三氯代磷酸酯,异尿酸氯,SOCI2,SO2CI2,PCI3,PCI5,POCl3,PBr3,SOBr2和SO2Br2反应,得到结构式为(III)的化合物,其中X和R的定义如结构式(I)中所述,然后在步骤B)中,将结构式为(III)的化合物与结构式为(IV)的马隆酸酯在碱和镁化合物的存在下反应,得到结构式为(V)的化合物,其中X和R的定义如结构式(I)中所述;R1的定义如结构式(IV)中所述;然后对结构式为(V)的化合物进行脱羧。可选地,得到的结构式为(I)的化合物进一步反应成结构式为(VIII)的三唑衍生物。此外,本发明还涉及结构式为(V)的化合物。