The present invention discloses a preparation method of cobimetinib (XL518, GDC-0973) (I). The preparation steps include: taking (2S)-2-piperidinecarboxylic acid as the raw material, performing acyl cyanation, hydrolysis, esterification and Boc protection to obtain an intermediate [2-oxo-2-((2S)-1-tert-butoxycarbonylpiperidin-2-yl)]acetate, performing an addition reaction, a reduction reaction and a cyclization reaction on the intermediate to obtain an intermediate (2S)-1-tert-butoxycarbonyl-2-(3-hydroxyazetidin-3-yl)piperidine, and performing a condensation reaction with a side chain to obtain the cobimetinib (I). The preparation method has the advantages of accessible raw materials, simple technique, high economy and environment friendliness, and is suitable for industrial production.
本发明公开了一种
氯贝替尼(XL518,
GDC-0973)(I)的制备方法。制备步骤包括以(2S)-2-
哌啶甲酸为原料,进行酰
氰化、
水解、酯化和Boc保护,得到中间体[2-氧代-2-((2S)-1-叔丁氧羰基
哌啶-2-基)]
乙酸酯,对该中间体进行加成反应、还原反应和环化反应,得到
哌啶-2-基
乙酸酯、对中间体进行加成反应、还原反应和环化反应,得到中间体(2S)-1-叔丁氧羰基-2-(3-羟基氮杂环丁-3-基)
哌啶,与侧链进行缩合反应,得到
氯贝替尼(I)。该制备方法具有原料易得、工艺简单、经济环保等优点,适合工业化生产。