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。