There is provided a process for the preparation of a compound of formula III, comprising the step of oxidising the compound of formula 2b wherein n is 2; R2a and R2b are independently H or F; R3 is 1-methylcyclopentylmethyl or 1-fluorocyclopentylmethyl; R3' is CH3 or F; R4 is C1-C6alkyl, C1-C6haloalkyl or C3-C6cycloalkyl, wherein C3-C6cycloalkyl is optionally substituted with methyl, CF3 or one or two fluoro. Compounds and processes used in the preparation of a compound of formula III are also provided.
提供了一种制备式 III 化合物的工艺,包括氧化式 2b 化合物的步骤 其中 n 为 2;R2a 和 R2b 独立地为 H 或 F;R3 为 1-甲基环戊基甲基或 1-
氟环戊基甲基;R3' 为
CH3 或 F;R4 为 C1-C6 烷基、C1-C6 卤代烷基或 C3-C6 环烷基,其中 C3-C6 环烷基任选被甲基、
CF3 或一或二
氟取代。还提供了用于制备式 III 化合物的化合物和工艺。