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CAS No. : | 1850312-96-7 | MDL No. : | MFCD28967930 |
Formula : | C6H5FN2O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | FXJPJHWARSJNGF-UHFFFAOYSA-N |
M.W : | 172.11 | Pubchem ID : | 118351785 |
Synonyms : |
|
Signal Word: | Danger | Class: | 9 |
Precautionary Statements: | P261-P264-P270-P272-P273-P280-P301+P312+P330-P302+P352-P305+P351+P338+P310-P333+P313-P391-P501 | UN#: | 3077 |
Hazard Statements: | H302-H315-H317-H318-H410 | Packing Group: | Ⅲ |
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 |
---|---|---|
Multi-step reaction with 2 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C 5.1: potassium carbonate / acetone / 60 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 6 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C 5.1: potassium carbonate / acetone / 60 °C 6.1: iron; acetic acid / ethanol; water / Reflux |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 7 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C 5.1: potassium carbonate / acetone / 60 °C 6.1: iron; acetic acid / ethanol; water / Reflux 7.1: N,N-dimethyl-formamide / 1 h / -20 - 20 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 8 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C 5.1: potassium carbonate / acetone / 60 °C 6.1: iron; acetic acid / ethanol; water / Reflux 7.1: N,N-dimethyl-formamide / 1 h / -20 - 20 °C 8.1: sulfuric acid / ethanol; water; tetrahydrofuran / 90 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 9 steps 1.1: sodium nitrite; tetrafluoroboric acid / water / 1 h / 0 - 20 °C 1.2: 24 h / 0 - 20 °C 2.1: copper / water / 24 h / 0 - 20 °C 3.1: oxone / methanol; water / 2 h / 0 - 20 °C 4.1: pyridinium hydrobromide perbromide; acetic acid / 45 °C 5.1: potassium carbonate / acetone / 60 °C 6.1: iron; acetic acid / ethanol; water / Reflux 7.1: N,N-dimethyl-formamide / 1 h / -20 - 20 °C 8.1: sulfuric acid / ethanol; water; tetrahydrofuran / 90 °C 9.1: potassium phosphate; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride / water; 1,2-dimethoxyethane / Reflux; Inert atmosphere |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% | Stage #1: 2-amino-5-fluoro-4-nitrophenol With tetrafluoroboric acid; sodium nitrite In water at 0 - 20℃; for 1h; Stage #2: sodium thiomethoxide With copper In water at 0 - 20℃; for 24h; | 14.2 Step 2) 5-fluoro-2- (methylthio) -4-nitrophenol Step 2) 5-fluoro-2- (methylthio) -4-nitrophenol To a 0 solution of 2-amino-5-fluoro-4-nitrophenol (5.2 g, 30.0 mmol) in 48tetrafluoroboric acid solution (15 mL) was added a solution of sodium nitrite (2.1 g, 30.0 mmol) in water (5 mL) . After the addition, the mixture was stirred at rt for 1 hour and poured into water (100 mL) . The resulting mixture was filtered under vacuum. The solid washed with water and triturated with acetone (40 mL) . After filtering, the filter cake was dried to give brown solid (3.5 g, 63) , which was used in the next step without further purification |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
81% | With sulfuric acid; nitric acid In dichloromethane at -10℃; for 2h; | 14.1 Step 1) 2-amino-5-fluoro-4-nitrophenol Step 1) 2-amino-5-fluoro-4-nitrophenol A solution of 2-amino-5-fluorophenol (5.5 g, 42.9 mmol) in DCM (15 mL) was cooled to -10 , and a mixed acid of concentrated nitric acid (2.8 g, 45.0 mmol) and concentrated sulfuric acid (10 mL) was added dropwise. After the addition, the mixture was stirred for 2 hours. The reaction mixture was poured into ice (50 g) , and the resulting mixture was adjusted to pH 6-7 with aqueous NaOH (1 M) and diluted with EtOAc (250 mL) . The mixture was separated. The organic layer was washed with water (50 mL × 2) and saturated aqueous NaCl (50 mL) , dried over anhydrous Na2SO4. The mixture was concentrated in vacuo. The residue was purified by silica gel column chromatography eluted with PE : EtOAc (V : V) 5 : 1) to give 2-amino-5-fluoro-4-nitrophenol as a light yellow solid (6.0 g, 81) .[0875]MS (ESI, pos. ion) m/z: 173.0 [M+H]+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With pyridinium p-toluenesulfonate In dichloromethane at 20℃; for 6h; | 12.III Step III, Preparation of 4-fluoro-5-nitro-2-((tetrahydro-2H-pyran-2-yl)oxy)aniline (Intermediate 3-6) Weigh intermediate 3-5 (860mg, 5mmol), 3,4-dihydro-2H-pyran (1680mg, 20mmol) and pyridinium p-toluenesulfonate (125.5mg, 0.5mmol), dissolve in 20mL dichloromethane, and react at room temperature for 6 hours . After the reaction is complete, add 20 mL of water and 20 mL of dichloromethane, extract and spin dry the dichloromethane. After separation and purification by silica gel column chromatography, intermediate 3-6 was obtained as a colorless oily substance with a yield of 70%. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridinium p-toluenesulfonate / dichloromethane / 6 h / 20 °C 2: toluene-4-sulfonic acid / 3 h / 105 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridinium p-toluenesulfonate / dichloromethane / 6 h / 20 °C 2: toluene-4-sulfonic acid / 3 h / 105 °C 3: iron; ammonium chloride / ethanol; water / 2 h / 78 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1: pyridinium p-toluenesulfonate / dichloromethane / 6 h / 20 °C 2: toluene-4-sulfonic acid / 3 h / 105 °C 3: iron; ammonium chloride / ethanol; water / 2 h / 78 °C 4: N-ethyl-N,N-diisopropylamine / dichloromethane / 2 h / Cooling with ice |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
37% | With aluminum (III) chloride; sodium iodide In dichloromethane at 20℃; | 12.II Step II, Preparation of 2-amino-4-nitro-5-fluorophenol (Intermediate 3-5) Weigh 4-fluoro-2-methoxy-5-nitroaniline (Intermediate 3-4) (372mg, 2mmol) and dissolve it in 20mL of dichloromethane. Add aluminum trichloride (1333mg, 10mmol) while stirring. , Divided into three times), sodium iodide (150mg, 1mmol) were added sequentially, and reacted overnight at room temperature. When the reaction is complete, add 20 mL of saturated ammonium chloride solution to neutralize the reaction, then add 20 mL of dichloromethane for extraction, wash the dichloromethane layer with saturated NaCl solution 3 times, and dry with anhydrous MgSO4. After the filtrate was concentrated, it was purified by flash silica gel column chromatography to obtain the pale yellow oily liquid intermediate 3-5, the yield: 37%. |
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