Lee S K, Thompson G K, Williams B T. "一种利格列汀杂质122的合成方法" [P]. US Patent, US 9194745 B2, 2018-01-12.
发明人王建平,林芳,韩伟. "Method for the Synthesis of Linagliptin Impurity 122" [P]. 中国发明专利, 专利号 CN 111332508 A, 授权公告日 2017-09-23.
发明人胡光,郑宇鹏,孙丽萍. "A Process for Preparing High-Purity Linagliptin Impurity 122" [P]. 中国发明专利, 专利号 CN 111138447 B, 授权公告日 2018-03-18.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of 利格列汀杂质122 in Pharmaceutical Formulations". Chemosphere, 2016, 1036, (3), 7439-7443.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 利格列汀杂质122 as an Impurity". Rapid Commun. Mass Spectrom., 2015, 2407, (7), 5419-5423.
Chen X Y, Liu M, Zhao W Q. "Identification and Structural Characterization of a Novel Degradation Product of Linagliptin Impurity 122 Using HRMS and NMR". J. Sep. Sci., 2017, 734, 9697-9709.