Nowak P, Kowalski A, Jørgensen K. "Method for the Synthesis of 6-cyclopropyl-1-(pyridin-4-ylmethyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid" [P]. European Patent, EP 3130420 A1, 2023-01-05.
参考文献 Literature
Kowalski T, Nowak Z. "Development and Validation of an LC-MS/MS Method for the Determination of 6-cyclopropyl-1-(pyridin-4-ylmethyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2022, 2053, (11), 5893-5907.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of 6-cyclopropyl-1-(pyridin-4-ylmethyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid as an Impurity". J. Nat. Prod., 2014, 1050, (11), 9726-9747.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of 6-cyclopropyl-1-(pyridin-4-ylmethyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid Using HRMS and NMR". J. Chromatogr. A, 2022, 1482, 8985-9000.