发明人沈红梅,孙丽萍,徐明华. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 114252693 A, 授权公告日 2017-02-20.
Patel M V, Fischer A B, Chen K W. "Method for the Synthesis of Ethyl 4-amino-1-methyl-6-oxo-2,6-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. US Patent, US 10233084 B2, 2024-03-08.
发明人韩伟,王建平,周伟. "A Process for Preparing High-Purity Ethyl 4-amino-1-methyl-6-oxo-2,6-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. 中国发明专利, 专利号 CN 108050827 B, 授权公告日 2023-03-17.
参考文献 Literature
Hughes D, Roberts J, Thomas A. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2017, 1957, (7), 9731-9745.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2024, 961, (11), 320-334.
Jensen P, Larsen A M, Olsen K. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-amino-1-methyl-6-oxo-2,6-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxylate Using HRMS and NMR". Biomed. Chromatogr., 2019, 485, (4), 7846-7860.