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CAS No. : | 4519-39-5 | MDL No. : | MFCD00010267 |
Formula : | C7H4F2O2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | JLZVIWSFUPLSOR-UHFFFAOYSA-N |
M.W : | 158.10 | Pubchem ID : | 370590 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* 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 |
---|---|---|
4,5-Diaminopyrimidine (1) (4.5 g, 0.04 moles) and 2,3-difluorobenzoic acid (2) (6.95 g, 0.044 moles) were suspended in 100 mL of Eaton's Acid. The reaction mixture was heated in an oil bath at 190 C. for 2 hours and then poured into 800 mL ice/water. Solid sodium hydroxide was added (59 g, 1.5 moles) to adjust to pH 5, which resulted in the product precipitating from solution. The product was filtered and washed twice with deionized water and air dried. The crude product was recrystallized from water/ethanol resulting in 8 g of pure product (3) (M+1=233). Purine (3) (500 mg, 2.15 mmoles) was dissolved in 10 mL of anhydrous DMF and 1.1 mL of sodium hydroxide solution (10% w/v) was added. 5-(Chloromethyl)-3-(4-chlorophenyl)isoxazole (4) (587 mg, 2.6 mmoles) was added to the above reaction mixture and the solution was stirred at room temperature overnight. The crude product was triturated from water followed by recrystallization from hot ethyl acetate. The precipitate was filtered to yield 30 mg of the gold colored solid 1-((3-(4-chlorophenyl)isoxazol-5-yl)methyl)-8-(2,3-difluorophenyl)-1H-purine 5) in high purity as determined by analytical LC/MS (M+1=429) and 1H NMR (400 MHz, DMSO-d6) delta 5.99 (s, 2H), 7.17 (s, 1H), 7.34 (m, 1H), 7.55 (s, 1H), 7.56 (d, 2H), 7.87 (d, 2H), 8.14 (m, 1H), 9.14 (s, 1H), 9.32 (s, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
2,3-Difluoro-benzoic acid (lOOmg), HATU (345.6 mg), and diisopropylethylamine (3 eq.) were added to DMF (90OuL) and stirred for 15 minutes. Pyridazine-3,4-diamine was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was evaporated, partitioned between water and ethyl acetate. The organic fraction was dried with sodium sulfate and concentrated in vacuo. The residue was then heated in acetic acid at reflux for one day. The mixture was evaporated and purified via reverse-phase HPLC to give 136 mg of 6-(2,3-difluoro-phenyl)-2H- imidazo[4,5-c]pyridazine. MS: 233.1 (M+H+) H'-NMR (DMSOd6): £(prhom) 9.04 (d, IH, 5.8Hz), 8.08 (m, IH), 7.96 (d, IH, 5.3 Hz) 7.70 (m, IH) 7.44 (m, IH) | ||
General Procedure JSynthesis of Compounds 245-2476-(2,3-difluoro-phenyl)-2H-imidazo[4,5-c]pyridazinePyridazine-3,4-diamine was synthesized as described by Kuraishi et al. in J. Het. Chem. 1964, 1, 42-47. MS: 111.1 (M+H+); H1-NMR (DMSO-d6): delta (ppm) 8.2-8.3 (m, 3H), 7.31 (s, 2H), 6.73 (d, 1H, 6.1 Hz).2,3-Difluoro-benzoic acid (100 mg), HATU (345.6 mg), and diisopropylethylamine (3 eq.) were added to DMF (900 uL) and stirred for 15 minutes. Pyridazine-3,4-diamine was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was evaporated, partitioned between water and ethyl acetate. The organic fraction was dried with sodium sulfate and concentrated in vacuo. The residue was then heated in acetic acid at reflux for one day. The mixture was evaporated and purified via reverse-phase HPLC to give 136 mg of 6-(2,3-difluoro-phenyl)-2H-imidazo[4,5-c]pyridazine. MS: 233.1 (M+H+) H1-NMR (DMSO-d6): delta (ppm) 9.04 (d, 1H, 5.8 Hz), 8.08 (m, 1H), 7.96 (d, 1H, 5.3 Hz) 7.70 (m, 1H) 7.44 (m, 1H) |