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CAS No. : | 113713-60-3 | MDL No. : | MFCD06658230 |
Formula : | C7H7N3OS | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | PNYFSMIUARCIRR-UHFFFAOYSA-N |
M.W : | 181.22 | Pubchem ID : | 11126879 |
Synonyms : |
|
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 |
---|---|---|
0.187 g | Compound 9c was obtained as described17 using 2,6-dichloropyridine as the starting material in five steps, including methoxylation, nitration, amination, reduction, and cyclization. The overall yield of this sequence was up to 45.7%. The structure of the product was identified by 1H NMR, MS, and IR. A solution of 0.5 g (3 mmol) 6-methoxy-3-nitropyridine-2-amine 100 ml CH3OH, 2 ml H2O, and 0.1 g Pd/C (10%) are allowed to shake with H2 (3 bar) in a hydrogenation apparatus until constant pressure. After filtration, the product solution is heated with 1 ml CS2 and 0.225 g KOH until reflux. When the reaction is completed (TLC control) the solvent is evaporated under reduced pressure. The resulted solid is recrystallized from ethanol. Yield: 0.187 g (1.1 mmol), 35%, mp: 223-225 C. IR: inlMMLBox (cm-1) = 3262; 3051; 1624. 1H NMR: (200 MHz, DMSO-d6) delta (ppm) = 12.99 (s, 1H, NH); 12.54 (s, 1H, NH); 7.43-7.47 (d, 1H, J = 8.5 Hz, H arom.); 6.55-6.60 (d, 1H, J = 8.5 Hz, H arom.); 3.83 (s, 3H, CH3). 13C NMR: (50 MHz, DMSO-d6) delta (ppm) = 167.60; 160.12; 143.62; 120.17; 119.65; 103.90; 53.49 | |
16.9 g | With potassium hydroxide; In ethanol; water; for 12.0h;Reflux; | To a solution of compound 2 (20.56 g, 148 mmol) in a mixture of EtOH (200 mL) and water (40 mL) was added KOH (9.75 g, 148 mmol) and CS2 (22.5 g, 296 mmol). The reaction mixture was stirred at reflux for 12 h. The solvents were evaporated, and the residue was purified by column chromatography on silica gel with eluent (2:98 to 10:90 MeOH/CH2Cl2), affording a gray solid product 3 (16.9 g, 63%). Rf = 0.50 (1:19 MeOH/CH2Cl2), mp 246-248 C. 1H NMR (DMSO-d6): delta 3.83 (s, 3H, OCH3), 6.56 (d, J = 8.5 Hz, 1H, Ar-H), 7.44 (d, J = 8.5 Hz, 1H, Ar-H), 12.73 (s, 2H, NH). MS (ESI): 182 ([M+H]+, 100%); MS (ESI): 180 ([M-H]-, 23%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; In ethanol; water; at 20℃; | General procedure: To a solution of compound 3 (360 mg, 2.0 mmol) in a mixture of EtOH (60 mL) and 1 N aq NaOH (2.2 mL, 2.2 mmol), compound 1 (2.1 mmol) was added. The resulting reaction mixture was stirred overnight at rt. Then solvents were removed under reduced pressure, and the crude product was purified by column chromatography on silica gel with eluent (0:100 to 3:97 MeOH/CH2Cl2) to give a white solid product 4 (50-65% yields). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; In ethanol; water; at 20℃; | General procedure: To a solution of compound 3 (360 mg, 2.0 mmol) in a mixture of EtOH (60 mL) and 1 N aq NaOH (2.2 mL, 2.2 mmol), compound 1 (2.1 mmol) was added. The resulting reaction mixture was stirred overnight at rt. Then solvents were removed under reduced pressure, and the crude product was purified by column chromatography on silica gel with eluent (0:100 to 3:97 MeOH/CH2Cl2) to give a white solid product 4 (50-65% yields). |
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