Chen K W, Fischer A B, Patel M V. "Method for the Synthesis of (3R,6R)-5-(tert-butoxycarbonyl)-1,1-difluoro-5-azaspiro[2.4]Heptane-6-carboxylic acid" [P]. US Patent, US 9833666 B2, 2021-02-09.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2013, 616, (3), 2327-2346.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Sep. Sci., 2011, 796, (12), 2422-2452.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of (3R,6R)-5-(tert-butoxycarbonyl)-1,1-difluoro-5-azaspiro[2.4]Heptane-6-carboxylic acid Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2022, 184, 6072-6077.
Yamamoto K, Tanaka H, Suzuki T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2014, 2084, 4113-4143.