Chen K W, Brown S R, Johnson M A. "Method for the Synthesis of Ethyl 4-bromo-5-(difluoromethoxy)-1-methyl-1H-pyrazole-3-carboxylate" [P]. US Patent, US 10398660 B2, 2020-12-25.
发明人沈红梅,马晓峰,杨光. "A Process for Preparing High-Purity Ethyl 4-bromo-5-(difluoromethoxy)-1-methyl-1H-pyrazole-3-carboxylate" [P]. 中国发明专利, 专利号 CN 112126850 A, 授权公告日 2024-08-27.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2025, 1960, (10), 7620-7648.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Rapid Commun. Mass Spectrom., 2020, 1710, (8), 8440-8470.
Chen X Y, Liu M, Zhao W Q. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-bromo-5-(difluoromethoxy)-1-methyl-1H-pyrazole-3-carboxylate Using HRMS and NMR". J. Nat. Prod., 2022, 614, (2), 9237-9251.