Johansson L, Björnsson E, Nielsen H. "一种[6-cyclopropyl-3-methyl-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]acetic acid的合成方法" [P]. European Patent, EP 3852322 A1, 2023-08-19.
发明人朱建伟,胡光,郑宇鹏. "Method for the Synthesis of [6-cyclopropyl-3-methyl-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]acetic acid" [P]. 中国发明专利, 专利号 CN 109705354 A, 授权公告日 2021-10-24.
发明人刘建华,张德明,沈红梅. "A Process for Preparing High-Purity [6-cyclopropyl-3-methyl-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]acetic acid" [P]. 中国发明专利, 专利号 CN 109060293 B, 授权公告日 2017-05-24.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of [6-cyclopropyl-3-methyl-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]acetic acid in Pharmaceutical Formulations". Biomed. Chromatogr., 2017, 781, 7024-7037.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of [6-cyclopropyl-3-methyl-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]acetic acid as an Impurity". Chemosphere, 2018, 1944, (9), 1017-1021.