With the rapid development and complex challenges of chemical substances, the synthesis of new drugs is usually one of the most effective ways to increase yield.100367-40-6, name is 2-Amino-5-bromo-4-methyl-3-nitropyridine, molecular formula is C6H6BrN3O2, molecular weight is 232.04, as common compound, the synthetic route is as follows.name: 2-Amino-5-bromo-4-methyl-3-nitropyridine
This reaction was conducted under inert gas protection. The reaction vessel was first charged with 2000 ml methanol and cooled to about 0 C. with slight agitation. Then 9.1 kg acetyl chloride was added. The exothermic reaction was then cooled and agitated for 10 minutes. The next addition was 100 g 2-amino-5-bromo-3-nitro-4-picoline (the compound of formula 2 at 0 C. Then 236.5 g of t-butyl nitrite was added at a rate such that the temperature did not exceed 5 C. The slight evolution of nitrogen gas was noted. After the completion of the reaction, cooling was removed and the reaction mixture within the vessel was allowed to warm to 25 C. in about 30 minutes. The mixture was agitated at 25 C. for about 3-4 hours. After 4-5 hours a clear solution was obtained. Reaction completeness was monitored by HPLC after about 4 hours. The reaction was complete after about 5 hours. The reaction mixture was concentrated in vacuo to about 1000 mL. Then 500 ml of water was added and the product precipitated. Then 250 ml saturated sodium bicarbonate solution was added with good agitation to neutralize the HCl and dissolve the hydroxy impurity. The mixture was agitated at 20-25 C. for about 15 minutes and then the precipitate was collected and washed with 1000 ml of water. The product was then dried at 40 C. in vacuo. Yield was 75.0 g. Analytical data: m.p. 132 C. IR (KBr, cm-1): 1633, 1581, 1538, 1512, 1458, 1377, 1344, 1321, 1244, 869, 779. 1H-NMR (DMSO-d6) (delta, ppm): 2.31 (s, 3H), 3.96 (s, 3H), 8.55 (s, 1H): 13C-NMR (DMSO-d6) (delta, ppm): 17.49, 54.91, 99.41, 114.39, 141.02, 149.23, 153.46; HRMS calcd for C7H7BrN2O3 245.96401 found (M+1): 246.97184; Elemental Analysis: calcd for C7H7BrN2O3: C 34.03, H 2.85, N 11.34; found: C 33.81, H 2.91, N 11.24.
At the same time, in my other blogs, there are other synthetic methods of this type of compound,100367-40-6, 2-Amino-5-bromo-4-methyl-3-nitropyridine, and friends who are interested can also refer to it.
Reference:
Patent; Liu, Wansheng; Patel, Sunil S.; Cuniere, Nicolas; Lear, Yvonne; Deshpande, Prashant P.; Simon, Jeffrey N.; Lai, Chiajen; Pullockaran, Annie J.; Soundararajan, Nachimuthu; Bien, Jeffrey T.; US2007/32503; (2007); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem