Patel M V, Johnson M A, Lee S K. "Method for the Synthesis of 6,8-Difluorospiro[chroman-2,1'-cyclobutan]-4-one" [P]. US Patent, US 9110334 B2, 2020-12-27.
Klinger H, Fischer A B, Yamamoto T. "A Process for Preparing High-Purity 6,8-Difluorospiro[chroman-2,1'-cyclobutan]-4-one" [P]. US Patent, US 10216101 B2, 2023-06-21.
参考文献 Literature
Yamamoto K, Tanaka H, Suzuki T. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2024, 257, 4441-4447.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Chromatogr. A, 2018, 2235, (10), 2566-2591.
Wang L, Li J, Zhang H. "Identification and Structural Characterization of a Novel Degradation Product of 6,8-Difluorospiro[chroman-2,1'-cyclobutan]-4-one Using HRMS and NMR". Chromatographia, 2022, 997, 3542-3557.