O'Brien P Q, Thompson G K, Anderson J P. "Method for the Synthesis of ethyl 4-chloro-1-ethyl-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. US Patent, US 10188365 B2, 2023-05-03.
参考文献 Literature
Hughes D, Roberts J, Thomas A. "Development and Validation of an LC-MS/MS Method for the Determination of 乙基 4-氯-1-乙基-3-甲基-1H-吡唑并[3,4-b]吡啶-5-甲酸基酯 in Pharmaceutical Formulations". Biomed. Chromatogr., 2010, 1996, (6), 8015-8020.
O'Brien K, Kennedy M L. "A Stability-Indicating HPLC Method for the Separation and Quantification of 乙基 4-氯-1-乙基-3-甲基-1H-吡唑并[3,4-b]吡啶-5-甲酸基酯 as an Impurity". Sci. Total Environ., 2011, 1176, (10), 3465-3481.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of ethyl 4-chloro-1-ethyl-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate Using HRMS and NMR". Talanta, 2025, 2176, (5), 176-195.
Lee J H, Choi Y S. "Forced Degradation Studies to Evaluate 乙基 4-氯-1-乙基-3-甲基-1H-吡唑并[3,4-b]吡啶-5-甲酸基酯 Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2014, 183, (11), 3929-3942.