Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 5470-17-7, name is 3-Bromo-2-chloro-5-nitropyridine. This compound has unique chemical properties. The synthetic route is as follows. Application In Synthesis of 3-Bromo-2-chloro-5-nitropyridine
Example BPreparation of 3-bromo-2-cyclopropylmethoxy-5-nitro-pyridineTo a solution of sodium hydride (2.21 g, 55.34 mmol) in anhydrous DMF (20ml) was added cyclopropylmethanol (CAS Registry No. 2516-33-8) (12.45 ml, 153.2 mmol) under nitrogen at 0 C and the reaction mixture was stirred at 25 C for 30 minutes. Then 3-bromo-2- chloro-5-nitropyridine (CAS Registry No. 5470-17-7) (7.3 g, 30.74 mmol) was added drop wise at 0 C and stirred for two hours at 25 C. Water (60ml) was added to the reaction mixture and extracted with ethyl acetate (3×100 ml). The combined organic layers were washed with water and brine, dried over Na2S04 and evaporated under reduced pressure to get the crude residue (12 g). The crude was purified by column chromatography (2% ethyl acetate/hexane) to get the desired product (2.06 g, 32%) as light yellow solid and 1.7g of unreacted 3-bromo-2-chloro-5- nitropyridine was recovered. MS (LC/MS): not responding, NMR is in agreement with the structure: 1H-NMR (400 MHz, CDC13): delta 0.41 (m, 2H), 0.65 (m, 2H), 1.32 (m, 1H), 4.34 (d, 2H), 8.60 (d, 1H), 8.96 (d, 1H).
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Reference:
Patent; F. HOFFMANN-LA ROCHE AG; GRETHER, Uwe; HEBEISEN, Paul; HOFFMANN, Torsten; ROEVER, Stephan; WO2012/49190; (2012); A1;,
Pyridine – Wikipedia,
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