Johansson L, Kowalski A, Nielsen H. "一种的合成方法" [P]. European Patent, EP 3661077 A1, 2020-01-18.
Johnson M A, Brown S R, Roberts E F. "Method for the Synthesis of Ethyl 5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate" [P]. US Patent, US 10118307 B2, 2024-09-27.
Stevens L M, Williams B T, Hughes D C. "A Process for Preparing High-Purity Ethyl 5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate" [P]. US Patent, US 11015768 B2, 2017-03-06.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Food Chem., 2016, 1047, (4), 1744-1770.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2017, 1817, (5), 8824-8852.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate Using HRMS and NMR". J. Pharm. Biomed. Anal., 2022, 152, (12), 669-681.
Yamamoto K, Tanaka H, Suzuki T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Molecules, 2015, 873, (2), 4447-4455.