Application of 573675-25-9, Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps,and cheap raw materials. 573675-25-9, name is 5-Bromo-3-nitropicolinonitrile. A new synthetic method of this compound is introduced below.
Under nitrogen atmosphere, a solution of 5-bromo-3-fluoro-pyridine-2-carbonitrile (1.005 g, 5.00 mmol) in dry N,N-dimethylformamide (15 ml) was cooled to -50C and to this was added dropwise a freshly prepared solution of sodium ethanethiolate (0.429 g, 5.10 mmol) in dry N,N-dimethylformamide (5 ml). After stirring at -50C for 30 minutes, the cooling bath was removed and the mixture was allowed to warm to room temperature. Water and brine were added and the aqueous mixture was extracted with ethyl acetate. After separation, the organic layer was washed twice with brine, dried over sodium sulfate and concentrated. The crude product was purified over silica by flash column chromatography (0 to 40% gradient of ethyl acetate in heptane) to afford the title compound (0.93 g) as a solid. GCMS (method 3): 242/244 (M)+, retention time 6.33 min. H-NMR (CDCI3, ppm) 1.41 (3H), 3.06 (2H), 7.82 (1 H), 8.49 (1 H). Alternative preparation method: Under nitrogen atmosphere, a solution of 5-bromo-3-nitro-pyridine-2- carbonitrile (45.35 g, 199 mmol) in dry N,N-dimethylformamide (500 ml) was cooled to -50C and to this was added dropwise a freshly prepared solution of sodium ethanethiolate (17.4 g, 207 mmol) in dry N,N-dimethylformamide (200 ml) (not a completely clear solution). After complete addition, stirring was continued at -50C for 30 minutes. Water and brine were added and the cooling bath was removed. The aqueous mixture was extracted with ethyl acetate. After separation, the water layer was extracted with ethyl acetate once more. The combined the organic layers were washed twice with brine, dried over sodium sulfate and concentrated. The crude product was purified over silica by flash column chromatography (0 to 25% gradient of ethyl acetate in heptane) to afford the title compound (33.9 g) as a solid. LCMS (method 1 ): 243/245 (M+H)+; retention time: 0.95 min.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,573675-25-9, its application will become more common.
Reference:
Patent; SYNGENTA PARTICIPATIONS AG; MUEHLEBACH, Michel; JUNG, Pierre, Joseph, Marcel; EDMUNDS, Andrew; EMERY, Daniel; BUCHHOLZ, Anke; (145 pag.)WO2017/16910; (2017); A1;,
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