Structure of 5-Methoxyquinolin-8-amine
CAS No.: 30465-68-0
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CAS No. : | 30465-68-0 |
Formula : | C10H10N2O |
M.W : | 174.20 |
SMILES Code : | NC1=C2N=CC=CC2=C(OC)C=C1 |
MDL No. : | MFCD01593679 |
InChI Key : | MFLLTRMMFHENCM-UHFFFAOYSA-N |
Pubchem ID : | 777110 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
* 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 |
---|---|---|
83% | With palladium on activated charcoal; hydrogen; In ethanol; at 20℃; for 6h;Inert atmosphere; | first, 5-methoxy-8-nitroquinoline (0.4 g, 2.33 mmol) was added to a two-neck eggplant flask and the mixture was made under nitrogen, and 50 ml of dehydrated ethanol was added to it. Palladium on carbon (0.04 g) was added under hydrogen and stirred at ambient temperature. After 6 hours, filtration was carried out using Celite, and the filtrate was concentrated with an evaporator to obtain a yellow solid was 0.333 g in a yield of 83% |
53% | With tin(II) chloride dihdyrate; In ethanol;Reflux; | 3. Synthesis of 5-methoxy-quinolin-8-ylamine (45); A suspension of 5-methoxy-8-nitroquinoline 44 (5.8 g, 28.5 mmol) and SnCI2.2H2O (19.3 g, 85.6 mmol) in ethanol (120 ml_) was heated to reflux for 1 hour. The reaction mixture was diluted with ethyl acetate and treated with 10% NaOH up to pH 11. The organic layer was separated, washed with brine, dried (Na2SO4), filtered and evaporated. The residue was purified by flash chromatography (SiO2, ethyl acetate/hexane, 0-40%) to obtain the final amine 45 (2.7 g, 53%) as a brown solid. 1H-NMR (400 MHz, CDCI3, ppm): 8.79 (H-2, dd, 1 H, J=1.7 and 4.2 Hz), 8.51 (H-4, dd, 1 H, J=1.7 and 8.5 Hz), 7.38 (H-3, dd, 1 H, J=4.2 and 8.5 Hz), 6.89 (H-7, d, 1 H, J=8.2 Hz), 6.73 (H-6, d, 1 H, J=8.2 Hz), 3.95 (OCH3, s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% | In methanol; at 4 - 20℃; | 4. Synthesis of 2-(5-methoxyquinolin-8-ylamino)-but-2-enedioic acid dimethyl ester (46); To a solution of 5-methoxyquinolin-8-ylannine 45 (2.7 g, 15.3 mmol) in methanol (20 ml_) at 40C, dimethylacetylenedicarboxylate (2.1 ml_, 16.8 mmol) was added. The reaction mixture was stirred and allowed to warm to room temperature for 3 hours. The solvent was evaporated and the residue was washed with MeOH and hexane, yielding an orange solid that was dried under vacuum (3.8 g, 79%).1H-NMR (400 MHz, CDCI3, ppm): 10.63 (NH, s, 1 H), 8.90 (H-2, dd, 1 H, J=1.7 and 4.2 Hz), 8.53 (H-4, dd, 1 H, J=1.7 and 8.4 Hz), 7.41 (H-3, dd, 1 H, J=4.2 and 8.4 Hz), 6.95 (H-7, d, 1 H, J=8.3 Hz), 6.73 (H-6, d, 1 H, J=8.3Hz), 5.44 (s, 1 H, CH=), 3.96 (OCH3, s, 3H), 3.77 (CO2CH3, s, 3H), 3.69 (CO2CH3, s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium carbonate; In acetonitrile; at 0℃; for 3.16h;Inert atmosphere; | first, sodium carbonate (0.285 g, 2.7 mmol) and 5 - methoxy - 8 - aminoquinoline (0.33 g, 1.91 mmol) were placed in a reaction vessel and the atmosphere was brought to an argon atmosphere, 5 mL of dehydrated acetonitrile was added. After bringing the reaction vessel to 0 C. in an ice bath, bromoacetyl bromide (0.2 mL, 2.3 mmol) was added over 10 minutes with stirring. After 3 hours, the white precipitate was removed by suction filtration using celite, the filtrate was concentrated by an evaporator and then dried under vacuum. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | With dmap; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; In dichloromethane; at 20℃; for 12h; | Operation: 5-methoxy-8-amino-quinoline (1.74g, 10mmol), 1 (2.99g, 12mmol), EDCI (2.88g, 15mmol), DMAP (0.12g, 1mmol) were added to 50 ml of CH2Cl2 solution and the reaction mixture was stirred for 12 hours. The reaction solution with HCl (2M) aqueous solution is acidified to PH= 3 and extracted with CH2Cl2(3x50ml) 3 times, the organic layer was treated with saturated salt water (50 ml), after washing, it was dried over anhydrous sodium sulfate. Using petroleum ether: ethyl acetate = 15:1 column to obtain 3.97g compound 2, yield 98%. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91% | [0223] Compound 1 (<strong>[30465-68-0]5-methoxyquinolin-8-amine</strong>, 4.5 g, 25.83 mmol) dissolved in methylene chloride (125 ml), andthen triethylamine (2.16 ml, 77.50 mmol) was added thereto, followed by stirring for 10 minutes. Pivaloyl chloride (2.9ml, 31.00 mmol) was slowly added to the reaction product and then stirred for 10 minutes. The reaction product wasquenched with an aqueous NaHCO3 solution and then an organic layer was wished with a NaHCO3 aqueous solutionthree times. An organic layer was dried over Na2SO4 and filtered, and then vacuum evaporated. A solid extracted byrecrystallization using EA and hexane was filtered and then dried, thereby obtaining Compound 2 (6.05 g, 91%).1H NMR (300 MHz, CDCl3) delta 10.04 (br s, N-H, 1H), 8.83-8.82 (dd, J = 4.2, 1.8Hz, 1H), 8.74-8.71 (d, J = 9.0 Hz, 1H),8.59-8.56 (dd, J = 8.4, 1.8Hz, 1H), 7.46-7.42 (dd, J= 8.4, 4.2Hz, 1H), 6.85-6.82 (d, J= 9.0 Hz, 1H), 3.99 (s, 3H), 1.42 (s, 9H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 0 - 20℃; | General procedure: To an oven-dried 100 mL three-necked flask, 4-phenylbutyric acid (1.6 g, 10 mmol), DMF (5drops) and DCM (20 mL) were added under a N2 atmosphere. Oxalyl chloride (1.0 mL, 12 mmol,1.2 equiv.) was added dropwise at 0 C resulting in vigorous bubbling. The mixture was stirred for 3h at room temperature, and the solvent was then removed in vacuo. The resulting acid chloride wasused immediately without further purification. To a solution of acid chloride in DCM(30 mL), thesolution of 8-amino-5-chroloquinoline (2.1 g, 12 mmol, 1.2 equiv.), Et3N (2.5 mL, 24 mmol, 2equiv.) in DCM (15 mL) were added dropwise to the solution at 0 C, and the solution was thenwarmed to room temperature. After stirring overnight, the reaction system was quenched with sat. aq.NaHCO3 (30 mL) and the organic layer was separated. The aqueous layer was extracted with DCM(2 x 15 mL). The combined organic layers were washed with 1 M HCl aq. (30 mL) and brine (30mL), dried over MgSO4, filtered and evaporated in vacuo. The resulting crude amide was purified bycolumn chromatography on silica gel (eluant: hexane/EtOAc = 4/1) to afford the desired amide as awhite solid (2.5 g, 77%). |
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