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CAS No. : | 1007346-33-9 | MDL No. : | MFCD00105294 |
Formula : | C4H3BrN2O | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | UWGFONONBAIDAF-UHFFFAOYSA-N |
M.W : | 174.98 | Pubchem ID : | 2782154 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P264-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P362-P403+P233-P501 | UN#: | N/A |
Hazard Statements: | 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 |
---|---|---|
74% | 57 4-(2,4-Dimethylphenyl)-1-(4-bromo-1H-pyrazol-5-ylmethylidene)thiosemicarbazide EXAMPLE 57 4-(2,4-Dimethylphenyl)-1-(4-bromo-1H-pyrazol-5-ylmethylidene)thiosemicarbazide The title compound was prepared from a mixture of 2,4-dimethylphenylthiosemicarbazide (50 mg, 0.256 mmol) and 4-bromo-1H-pyrazole-5-carboxaldehyde (54 mg, 0.31 mmol) similar to Example 3 and isolated as an off-white solid (67 mg, 74%). 1H NMR (DMSO-d6): 9.98 (s, 1H), 8.15 (s, 1H), 8.02 (s, 1H), 7.86 (s, 1H), 7.16-7.03 (m, 3H), 3.85 (m, 4H), 3.13 (m, 4H), 2.30 (s, 3H), 2.18 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | Stage #1: 4-bromo-1H-pyrazole-5-carboxaldehyde With sodium hydride In tetrahydrofuran at 0℃; for 0.166667h; Stage #2: (2-trimethylethylsilylethoxy)methyl chloride In tetrahydrofuran for 2h; | 116.1 Preparation of 4-bromo-l-{ [2- (trimethylsilyl) ethoxy]methyl}- lH-pyrazole-5-carbaldehyde To a stirred suspension of 4-bromo-lH-pyrazole-5- carbaldehyde (1.93 g, 11 iranol) in THF (50 mL) was added sodium hydride (0.484 g, 12.1 mmol) at 00C. After 10 min, [2-(chloromethoxy)ethyl] (trimethyl) silane (2.34 mL, 13.2 mmol) was added. After 2 h, the mixture was poured into saturated aqueous NaHCO3 and extracted with EtOAc (100 mL) , and the extract was dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography (Purif, silica gel, hexane to 80:20 hexane/EtOAc) to afford the title compound (2.30 g, 69%) as a colorless oil:1H NMR (300 MHz, CDCl3) δ 0.00 (9H, s) , 0.94 (2H, t, J = 8.1 Hz), 3.60 (2H, t, J = 8.1 Hz), 5.48 (2H, s) , 7.70 (IH, s) , 10.00 (IH, s). |
39% | With sodium hydride In N,N-dimethyl-formamide at 20℃; for 18h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium tetrahydroborate; acetic acid In isopropyl alcohol | 25 EXAMPLE 25 The tert-butyl 4-[4-bromo-3-(hydroxymethyl)pyrazol-1-yl]piperidine-1-carboxylate used as starting materials were made as follows: Sodium tetrahydroborate (35.7 mg) was added to 4-bromo-2H-pyrazole-3-carbaldehyde (150 mg) suspended in 2-propanol (10 ml). The resulting suspension was stirred at 25° C. for 1 hour. A few drops of acetic acid were added and the solution was concentrated to dryness. The crude product was purified by flash chromatography on silica gel eluding with 100% ethyl acetate. The solvent was evaporated to dryness to afford (4-bromo-2H-pyrazol-3-yl)methanol (110 mg). NMR Spectrum: (DMSO-d6+TFAd) 4.44 (s, 2H), 7.69 (s, 1H); Mass spectrum: M+H+ 177-179. | |
With sodium tetrahydroborate In tetrahydrofuran at 50℃; for 1h; | 12.1 (4-Bromo-1H-pyrazol-5-yl)methanol Sodium tetrahydroborate (0.13 g, 3.4 mmol) was added to a solution of 4-bromo-1H-pyrazole-5-carbaldehyde (0.30 g, 1.7 mmol, from Maybridge) in tetrahydrofuran (5 mL). The reaction mixture was stirred at 50° C. for 1 h. The reaction mixture was quenched with saturated aqueous NaHCO3, and extracted with ethyl acetate (3×20 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated under reduced pressure to afford the crude product which was directly used in the next step reaction without further purification. LCMS calculated for C4H6BrN2O (M+1)+: m/z=177.0. Found: 176.9. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate In acetonitrile | 60 1-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]-1-(4-piperidyl)pyrazol-3-yl]ethanol The tert-butyl 4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]-3-(1-hydroxyethyl)pyrazol-1-yl]piperidine-1-carboxylate used as starting material was prepared as follows: 4-bromo-2H-pyrazole-3-carbaldehyde (3 g), potassium carbonate (3.32 g) and tert-butyl 4-methylsulfonyloxypiperidine-1-carboxylate (6.23 g) in acetonitrile (150 ml) were stirred at reflux overnight. The resulting precipitate was removed by filtration and the filtrate was concentrated and purified by flash chromatography on silica gel eluding with 0 to 20% ethyl acetate in petroleum ether. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% | With sodium tris(acetoxy)borohydride; acetic acid In 1,2-dichloro-ethane at 25℃; for 2.5h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | With sodium tris(acetoxy)borohydride; at 20℃; for 3h; | (R)-2-(Benzylamino)propan-1-ol (800 mg, 4.8 mmol)And 3-aldehyde-4-bromopyrazole (703 mg, 4 mmol) were added to a solution of 1,1-dichloroethane (15 mL), respectively.Sodium triacetoxyborohydride (2.55 g, 12 mmol) was then added to the reaction mixture and allowed to react at room temperature for 3 h.The reaction mixture was diluted with water and extracted with dichloromethane (3×).The organic phase is filtered, concentrated under reduced pressure and purified by silica gel column to give product(R)-2-(Benzyl((4-bromo-1H-pyrazol-5-yl)methyl)amino)propan-1-ol (905 mg, yield 73%). |
70% | With sodium tris(acetoxy)borohydride; In methanol; at 20℃; for 2h; | 4-bromopyrazole-5-carboxaldehyde (875 mg, 5 mmol) and <strong>[74609-49-7](R)-2-(benzylamino)propan-1-ol</strong> (996 mg, 6 mmol) were added to a solution of methanol (20 mL). Sodium triacetoxyborohydride (3.18 g, 15 mmol) was then added to the reaction mixture. After reacting for 3 h at room temperature, the reaction mixture was diluted with water and extracted three times with ethyl acetate. The organic phase was combined and dried over anhydrous Na2SO4. (R)-2-(Benzyl((4-bromo-1H-pyrazol-5-yl)methyl)amino)propan-1-ol (1.13 g, yield 70%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium metabisulfite; In N,N-dimethyl acetamide; for 5h;Inert atmosphere; Reflux; | Under the argon 2-amino-6-fluoro-benzamide (77 mg, 0 . 50mmol) dissolved in dimethylacetamide (5 ml) in, by adding 4-bromo -1H-pyrazole-5-formaldehyde (88 mg, 0 . 50mmol) and Na 2 S 2 O 5 (143 mg, 0 . 75mmol), and the mixture stirred under the reflow conditions for 5 hours. After the cooling to room temperature, the reaction mixture is concentrated, and dissolved in acetonitrile and N, N-dimethyl formamide in a mixture. Filtered and thoroughly drying the remaining solid, get colorless solid 2 - (4-bromo -1H-pyrazol-5-yl) - 5- [...] -4 (3H)-one (30 mg, of the setpoint value of 19%). 1 HNMR (400MHz, d 6-DMSOdelta, PPM) 13.91 (br.s, 1H, NH), 12.03 (br.s, 1H, NH), 8.22 (s, 1H), 7.80 (dd, 1H), 7.51 (d, 1H), 7.27 (dd, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
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With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
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With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
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With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid In dimethyl sulfoxide at 20℃; for 24h; |