Related Products of 794592-13-5, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 794592-13-5, name is Ethyl 5-bromo-3-methylpicolinate, molecular formula is C9H10BrNO2, The compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
To A solution of ethyl 5-bromo-3-methylpyridine-2-carboxylate (1.6 G ; 6. 95 mmol) and benzoyl peroxide (84. 23 mg ; 0. 347 mmol) in carbon tetrachloride (20 ML) was added N-BROMOSUCCINIMIDE (2.47 G ; 13. 91 mmol). The reaction mixture was heated at reflux for 3 h. Another equivalent of N-bromosuccinimide and benzoyl peroxide (85 mg) was added and refluxing was continued for a further 7 h. Reaction was monitored by MS. After 10 h the product was the major peak. The reaction mixture was allowed to cool, filtered through celite washed with carbon tetrachloride. The filtrate was evaporated under reduced pressure to give an oil, 2.7 g. The oil (2.7 g ; 6.9615 mmol) and hydrazine hydrate (2.4 mL) in ethanol was heated at reflux overnight. The solvent was evaporated under reduced pressure, the residue was taken-up in water acidified with 2N HCl the solid obtained was collected by filtration washed with water and dried by azeotroping with toluene. Yield = 0.9 g. The crude product and phosphorus oxychloride were heated at 60 for 1 h. The excess phosphorus oxychloride was evaporated under reduced pressure to give 3-BROMO-8-CHLOROPYRIDO [2, 3-D] PYRIDAZINE (0.97 g) as solid. This material was azeotroped with toluene and then treated with 4- aminobenzotrifluoride (0.64 g, 0.495 mL ; 3. 97 mmol) in 1, 4-dioxane (20ml) and heated at 40 for 1 h. The solvent was evaporated under reduced pressure and the residue partitioned between ethyl acetate and sodium carbonate solution. The ethyl acetate extracts were combined, washed with brine, dried over magnesium sulphate, filtered and evaporated under reduced pressure to give an oil. The oil was purified by flash chromatography using a gradient of (90->50%) ISO- HEXANE/ETHYL acetate. The appropriate fractions were combined and evaporated under reduced pressure to give 3-BROMO-N-(4-(TRIFLUOROMETHYL) PHENYL) PYRIDO [2, 3- D] PYRIDAZIN-8-AMINE (100 MG). H NMR (500 MHz, DMSO-D6) 8 : 7.73 (2H, d, J8. 6 Hz), 8.41 (2H, d, J8. 8 Hz), 8.91 (1H, d, J2.2 Hz), 9.25 (1H, s), 9.33 (1H, d, J2.2 Hz), 10.05 (1H, s). The amine was reacted as in Example 4 to give the title COMPOUND. LH NMR (500 MHz, DMSO-d6) 8 : 2.49 (3H, s), 7.49 (1H, dd, J4.8 and 7.7 Hz), 7.76 (2H, d, J8.6 HZ), 7.90 (1H, dd, J0. 5 and 7.1 Hz), 8.47 (2H, d, J8. 6 Hz), 8. 66 (1H, dd, J0. 5 and 4.2 Hz), 8. 80 (1H, d, J2.0 Hz), 9.39 (1H, s), 9.48 (1H, d, J2.0 Hz), 10.10 (1H, s) ; MS (ES M+1) 382
According to the analysis of related databases, 794592-13-5, the application of this compound in the production field has become more and more popular.
Reference:
Patent; MERCK SHARP & DOHME LIMITED; WO2004/99177; (2004); A1;,
Pyridine – Wikipedia,
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