Electric Literature of 2457-47-8, 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 2457-47-8 as follows.
PREPARATION 27 3,5-Dichloro-4-pyridinecarboxylic acid To a solution of 4.96 ml (0.036 mole) of diisopropylamine in 200 ml of tetrahydrofuran at -65 C. under a nitrogen blanket was added dropwise 14.9 ml of 2.5M n-butyllithium in hexane while maintaining the above temperature. Twenty minutes subsequent to that addition, a solution 5.0 g (0.034 mole) of 3,5-dichloropyridine in 30 ml tetrahydrofuran at -60 to -70 C. was added. The reaction mixture was stirred at -70 C. for 1/2 hr, poured onto a large excess of dry ice and allowed to evaporate overnight at room temperature. The residue was taken up in 100 ml of dilute aqueous sodium hydroxide, washed with 3*30 ml of methylenechloride and filtered. The filtrate was acidified to ~pH 2 with dilute hydrochloric acid to precipitate out the product. After cooling, the precipitate was collected and recrystallized from ethyl acetate/hexane giving 1.9 g (29%) of white analytically pure crystals, m.p. 231-35 C. (decomp.). Analysis: Calculated for C6 H3 NO2 Cl2: C, 37.53; H, 1.57; N, 7.30. Found: C, 37.33; H, 1.56; N, 7.21.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,2457-47-8, its application will become more common.
Reference:
Patent; A. H. Robins Company, Inc.; US4705853; (1987); A;,
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