Anderson J P, Brown S R, Roberts E F. "一种的合成方法" [P]. US Patent, US 9230596 B2, 2022-03-19.
Lee S K, Schröder R, Hughes D C. "Method for the Synthesis of Tert-butyl 1,1-difluoro-9-oxo-3-azaspiro[5.5]Undecane-3-carboxylate" [P]. US Patent, US 9702141 B2, 2017-10-16.
发明人赵玉洁,朱建伟,徐明华. "A Process for Preparing High-Purity Tert-butyl 1,1-difluoro-9-oxo-3-azaspiro[5.5]Undecane-3-carboxylate" [P]. 中国发明专利, 专利号 CN 114687850 A, 授权公告日 2021-05-15.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Environ. Sci. Technol., 2025, 140, (5), 8533-8550.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Methods, 2019, 1397, (8), 7295-7303.
Jensen P, Larsen A M, Olsen K. "Identification and Structural Characterization of a Novel Degradation Product of Tert-butyl 1,1-difluoro-9-oxo-3-azaspiro[5.5]Undecane-3-carboxylate Using HRMS and NMR". Chromatographia, 2023, 1643, 2629-2651.