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CAS No. : | 154093-72-8 | MDL No. : | MFCD25973506 |
Formula : | C13H9F2NO4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | NTWOKQCCNHKEIU-UHFFFAOYSA-N |
M.W : | 281.21 | Pubchem ID : | 11680737 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89.6% | With water; hydrogen bromide; acetic acid; at 100℃; | Embodiment 1 Preparation of 1-Cyclopropyl-6,7-difluoro-8-hydroxyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid The preparation comprises dissolving Ethyl 1-cyclopropyl-6,7-difluoro-8-methoxy-1,4-dihydro-4-oxoquinoline-3-carboxylate (10.0g, 30.9mmol) in 40% HBr aqueous solution (20 mL) and acetic acid (20 mL) to react at 100C, charging reaction mixture into ice water (500 mL) under fast stirring after the reaction finishes, going on with the stirring for 0.5 h, filtering, and drying obtained filter cake to give 1-cyclopropyl-6,7-difluoro-8-hydroxy-1,4-dihydro-oxoquinoline-3-carboxylic acid (7.8 g, 89.6%). 1H NMR(DMSO) delta =1.01-1.27(4H, m), 4.25-4.33(1H, m), 7.67(1H, dd, J=8.1Hz, J=12.6Hz), 8.68(1H, s), 11.64(1H, s), 14.71(1H, br.). MS(m/z): 282(M+ +1). |
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