Hughes D C, Chen K W, Johnson M A. "一种的合成方法" [P]. US Patent, US 11936751 B2, 2022-11-19.
Hughes D C, Park J H, Davis P L. "Method for the Synthesis of Ethyl 2-methylpyrazolo[1,5-a]pyrimidine-3-carboxylate, 97%" [P]. US Patent, US 10175517 B2, 2021-01-27.
Björnsson E, Nielsen H, Kowalski A. "A Process for Preparing High-Purity Ethyl 2-methylpyrazolo[1,5-a]pyrimidine-3-carboxylate, 97%" [P]. European Patent, EP 3451630 A1, 2016-09-04.
参考文献 Literature
Zhou X P, Huang L, Wu G. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2014, 1465, 5762-5778.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Agric. Food Chem., 2015, 1584, 6580-6607.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 2-methylpyrazolo[1,5-a]pyrimidine-3-carboxylate, 97% Using HRMS and NMR". Anal. Chem., 2017, 210, 2316-2331.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Chemosphere, 2017, 172, 7531-7540.