发明人罗永刚,李文辉,周伟. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 115699679 A, 授权公告日 2020-05-10.
发明人陈志强,高志强,冯建国. "Method for the Synthesis of (R)-4-(tert-Butoxycarbonyl)-3-methylmorpholine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114941553 B, 授权公告日 2023-10-24.
发明人赵玉洁,冯建国,张德明. "A Process for Preparing High-Purity (R)-4-(tert-Butoxycarbonyl)-3-methylmorpholine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115742693 B, 授权公告日 2015-04-13.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Sep. Sci., 2013, 926, 3116-3126.
Zhou X P, Huang L, Wu G. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Anal. Chem., 2019, 489, (1), 8805-8830.
Wang L, Li J, Zhang H. "Identification and Structural Characterization of a Novel Degradation Product of (R)-4-(tert-Butoxycarbonyl)-3-methylmorpholine-3-carboxylic acid Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2020, 1736, (6), 4287-4317.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". Environ. Sci. Technol., 2019, 2223, (12), 122-141.