Electric Literature of 1221171-96-5, In the chemical reaction process,reaction time,type of solvent,can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product.An updated downstream synthesis route of 1221171-96-5 as follows.
4-Amino-2-chloro-6-trifluoromethoxypyridine (45); At -78 0C, butyllithium (1.56 M in hexane, 2.2 mL, 3.4 mmol, 1.1 eq) was added dropwise to a solution of 2-chloro-4-iodo-6-trifluoromethoxypyridine (42, 1.0 g, 3.1 mmol) in THF (8 mL) followed after 10 min by benzenesulfonyl azide (0.6 g, 3.4 mmol, 1.1 eq). The reaction mixture was was allowed to reach 25 0C before being treated with a saturated aqueous solution of ammonium chloride (10 mL) and extracted with diethylehter (3 x 8 mL). The combined organic layers were dried over sodium sulfate and evaporated to afford a crude red oil of 4-azido-2-chloro-6- trifluoromethoxypyridine. It was then dissolved in anhydrous diethylether (25 mL) and added dropwise to a suspension of lithium aluminium hydride (130 mg, 3.4 mmol, 1.1 eq) in diehtylether (25 mL). The reaction mixture was heated under reflux for 5 h before being treated with water (10 mL) and extracted with diethylether (3 x 10 mL). The combined organic layers were dried over sodium sulfate before being evaporated. The crude product was purified by chromatography on silica gel using ethyl acetate/cyclohexane (1:9) as eluent which afforded pure 4-amino-2-chloro-6- trifluoromethoxypyridine (45, 0.3 g, 1.4 mmol, 46%) as a yellow oil.1H NMR (CDCl3, 300 MHz): delta = 6.41 (d, J = 1.6 Hz, 1 H), 6.07 (d, J = 1.6 Hz, 1 H),4.30 (bs, 2 H). – 19F NMR (CDCl3, 282 MHz): delta = -56.8 – 13C NMR (CDCl3, 75 MHz): delta = 157.4, 156.7, 149.7, 119.9 (q, J = 260 Hz), 107.6, 96.0. – C6H4ClF3N2O (212): calcd. (%) C 33.90, H 1.90, N 13.18; found C 33.56, H 2.01, N 12.87.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,1221171-96-5, its application will become more common.
Reference:
Patent; BAYER CROPSCIENCE AG; PAZENOK, Sergii; VORS, Jean-Pierre; LEROUX, Frederic, R.; MANTEAU, Baptiste; CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE; UNIVERSITE DE STRASBOURG; WO2010/40461; (2010); A1;,
Pyridine – Wikipedia,
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