Nowak P, Jørgensen K, Sørensen M. "Method for the Synthesis of 3-(3,3-Difluoro-2-oxopropylidene)piperazin-2-one" [P]. European Patent, EP 3565862 A1, 2023-08-15.
发明人韩伟,高志强,何建平. "A Process for Preparing High-Purity 3-(3,3-Difluoro-2-oxopropylidene)piperazin-2-one" [P]. 中国发明专利, 专利号 CN 109182636 B, 授权公告日 2017-03-19.
参考文献 Literature
Yamamoto K, Tanaka H, Suzuki T. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". Talanta, 2015, 695, (11), 7792-7807.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Anal. Methods, 2013, 1638, (5), 1951-1957.
Smith J A, Johnson M B. "Identification and Structural Characterization of a Novel Degradation Product of 3-(3,3-Difluoro-2-oxopropylidene)piperazin-2-one Using HRMS and NMR". Anal. Chim. Acta, 2021, 2323, (10), 7972-7980.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2014, 2303, (3), 1164-1182.