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CAS No. : | 105994-55-6 | MDL No. : | MFCD05664675 |
Formula : | C10H9BrN2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | RHOKURUCEBPOIH-UHFFFAOYSA-N |
M.W : | 237.10 | Pubchem ID : | 13692440 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
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 |
---|---|---|
34% | With N-Bromosuccinimide In acetonitrile at 70℃; for 1 h; | B. 4-Bromo-1-methyl-3-phenyl- H-pyrazole and 4-bromo-1-methyl-5-phenyl-1H- pyrazole.; The mixture of isomers, l-methyl-3-phenyl-1H-pyrazole and l-methyl-5-phenyl- ;H-pyrazole (1.0g, 6.3 mmol) and NBS (l.lg, 6.3 mmol) are combined in acetonitrile (25 ml), stirred and heated to 70 °C for 1 hr. The solution is concentrated and the crude product is purified by chromatography using a hexane-ethyl acetate gradient (100percent hexane to 25percent ethyl acetate in hexane) to elute 4-bromo-1-methyl-3-phenyl-1H-pyrazole (504 mg, 34percent yield) and 4-bromo-1-methyl-5-phenyl-1H-pyrazole (295 mg, 20percent yield), respectively:1H NMR: (400 mHz, DMSO): δ 8.01 (s, 1H), 7.95 (d, 2H), 7.41 (t, 2H), 7.38 (d, 1H), 3.85(s, 3H).1H NMR: (400 mHz, DMSO): δ 7.63 (s, 1H), 7.50 (m, 5H) 3.77 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
184 mg | Stage #1: With n-butyllithium In tetrahydrofuran; hexane at -80℃; for 0.5 h; Stage #2: at -80 - 20℃; for 4 h; |
0124-2 A 1.6 mol/L n-butyllithium-hexane solution (1.2 mL) was added to a solution of 4-bromo-1-methyl-3-phenyl-1H-pyrazole (300 mg) in tetrahydrofuran (6 mL) at -80° C., followed by stirring at the same temperature for 30 minutes, and 2-isopropyloxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (470 mg) was added thereto at the same temperature, followed by stirring while heating to room temperature over a period of 4 hours. A saturated ammonium chloride aqueous solution and ethyl acetate were added to the reaction mixture. The organic layer was collected by separation, washed with a saturated sodium chloride aqueous solution, and dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate-hexane), thereby obtaining 1-methyl-3-phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (184 mg). MS m/z (M+H): 285. |
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