5470-17-7, 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. 5470-17-7, name is 3-Bromo-2-chloro-5-nitropyridine. A new synthetic method of this compound is introduced below.
34b. 3-bromo-2-methyl-5-nitropyridine A solution of diethyl malonate (17.6 mL, 0.116 mol) in diethyl ether (250 mL) at ambient temperature was treated with sodium hydride (80% in mineral oil, 3.5 g, 0.116 mol), and the mixture was stirred for 1 hour. Then 3-bromo-2-chloro-5-nitropyridine (25 g, 105 mmol; prepared from 2-hydroxy-5-nitropyridine according to the procedure of V. Koch and S. Schnatterer, Synthesis 1990, 499-501) was added in portions over 5 minutes. After the mixture had stirred for 1 hour, the solvent was evaporated, and the residue was heated at 100 C. for 1 hour. After the mixture had cooled, 12 N H2 SO4 was added, and the mixture was heated at reflux for about 16 hours. The mixture was allowed to cool to ambient temperature, then further cooled as it was treated with 50% NaOH to give an alkaline pH. The resulting solution was extracted with CHCl3 (3*), and the organic extracts were washed with H2 O, dried (MgSO4) and evaporated to afford 17.1 g of the title compound as a red oil: 1 H NMR (CDCl3, 300 MHz) delta 2.81 (s, 3H), 8.61 (d, J=2 Hz, 1H), 9.26 (d, J=2 Hz, 1H).
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles. 5470-17-7, 3-Bromo-2-chloro-5-nitropyridine, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; Abbott Laboratories; US6133253; (2000); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem