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CAS No. : | 3537-14-2 | MDL No. : | MFCD10697697 |
Formula : | C5H6N4O2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | JOQJNCSAEMIZOU-UHFFFAOYSA-N |
M.W : | 154.13 | Pubchem ID : | 3480151 |
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 |
---|---|---|
100% | With ammonium sulfide; In methanol; water; at 75℃; | 3,5-Dinitropyridin-2-amine (4.0 g, 21.7 mmol) was suspended in methanol (150 mL), and a 20% aqueous solution of ammonium sulfide (31.7 mL, 109 mmol, 5 eq.) was then added. A mixture resulted as the temperature was raised to 75C for 30 minutes. The mixture was allowed to cool and then placed in an ice bath, where a precipitate formed. The solids were collected by filtration, yielding 5-nitropyridine-2,3-diamine (3.4 g, 100%) as a solid. 1H NMR (400 MHz, DMSOd6) delta 8.28-8.29 (m, IH), 7.35-7.37 (m, IH), 6.99 (br s, 2H), 5.32 (br s, 2H). |
99% | With diammonium sulfide; In methanol; water; at 75℃; for 0.5h; | 3,5-Dinitropyridin-2-amine (300.0 mg, 1.63 mmol) and ammonium sulfide solution (2.4 mL, 8.15 mmol) was dissolved in MeOH (11.3 mL), and it was stirred at 75 C. for 30 minutes and then cooled to room temperature. The formed solid was filtered and then dried under reduced pressure to obtain red solid compound of 5-nitropyridine-2,3-diamine (250.0 mg, 99%). [1183] LCMS ESI (+): 155 (M+1) [1184] 1H-NMR (400 MHz, DMSO-d6); delta:8.29 (d, 1H, J=1.8 Hz), 7.36 (d, 1H, J=1.8 Hz), 6.99 (s, 2H), 5.32 (s, 2H) |
3.2 g | With diammonium sulfide; In methanol; water; for 1h;Reflux; | A solution of 3,5-Dinitropyridine-2-amine (3.9 g, 21.2 mmol, 1 eq) in Methanol (80 ml) was treated with 20% aqueous (NH^S (36.1 ml, 106 mmol, 5 eq) and heated to reflux for 1 hour. After cooling, the solid was collected by filtration and dried. The product was used without further purification. Yield: 3.2 g (98%); ESI-MS m/z: 155.0 [M+H]+; HPLC (Gradient A): rt 4.08 min, 100 %; 1H-NMR (DMSO-d6) d: 5.31 (br s, 2H), 6.98 (br s, 2H), 7.36 (d, 1 H, 4J=2.2 Hz), 8.28 (d, 1 H, 4J=2.6 Hz) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1.0 g <strong>[3537-14-2]2,3-diamino-5-nitropyridine</strong> and 1.125 g 4-methylsulfanylbenzoic acid in 20 ml polyphosphoric acid were heated to 160 C. with stirring for 15 hrs. The mixture was cooled and poured into water. The pH was adjusted to 4-5 by addition of sodium hydroxide and the precipitate collected by filtration. The filtration residue was stirred in 50 ml pyridine at 60 C., cooled and insoluble components removed by filtration. The filtrate was evaporated and the residue used without further purification in the next steps. Yield 0.656 g of 30% purity | ||
Example 4-1 [2-(4-Methylsulfanyl-phenyl)-3H-imidazo[4,5-b]pyridin-6-yl]-carbamic acid isopropyl ester a) 2-(4-Methylsulfanyl-phenyl)-6-nitro-3H-imidazo[4,5-b]pyridine; 1.0 g <strong>[3537-14-2]2,3-diamino-5-nitropyridine</strong> and 1.125 g 4-methylsulfanylbenzoic acid in 20 ml polyphosphoric acid were heated to 160 C. with stirring for 15 hrs. The mixture was cooled and poured into water. The pH was adjusted to 4-5 by addition of sodium hydroxide and the precipitate collected by filtration. The filtration residue was stirred in 50 ml pyridine at 60 C., cooled and insoluble components removed by filtration. The filtrate was evaporated and the residue used without further purification in the next steps. Yield 0.656 g of 30% purity |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In nitrobenzene; at 160℃; for 26h; | 1.00 g 2,3-diamino-5-nitro-pyridine and 0.95 g 3,4-difluorobenzaldehyde were stirred in 60 ml nitrobenzene at 160 C for 26 hrs. The solvent was removed under vacuum and the residue dissolved in 40 ml pyridine at 60 C. The solution was cooled in an ice bath. Precipitated product was isolated by filtration and dried to yield 0.5 g of the title product. | |
In nitrobenzene; at 160℃; for 26h; | Example 10-1 [2-(3,4-Difluoro-phenyl)-3H-imidazo[4,5-b]pyridin-6-yl]-carbamic acid isopropyl ester a) 2-(3,4-Difluoro-phenyl)-6-nitro-3H-imidazo[4,5-b]pyridine; 1.00 g 2,3-diamino-5-nitro-pyridine and 0.95 g 3,4-difluorobenzaldehyde were stirred in 60 ml nitrobenzene at 160 C. for 26 hrs. The solvent was removed under vacuum and the residue dissolved in 40 ml pyridine at 60 C. The solution was cooled in an ice bath. Precipitated product was isolated by filtration and dried to yield 0.5 g of the title product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In nitrobenzene; at 160℃; for 30h; | 0.87 g 3-carboxybenzaldehyde and 0.866 g <strong>[3537-14-2]2,3-diamino-5-nitropyridine</strong> in 50 ml nitrobenzene were heated to 160 C. for 30 hrs. The mixture was cooled to room temperature and 200 ml ethyl acetate and 100 ml ethyl ether were added. The precipitated product was collected by filtration and dried. Yield 1.135 g |