Electric Literature of 75806-86-9 ,Some common heterocyclic compound, 75806-86-9, molecular formula is C5H2BrClN2O2, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.
Example 8: delta-Chloro-3-nitro-pyridine^-carboxylic acid; [00388] Step 1 : To a mixture of 2-bromo-5-chloro-3-nitro-pyridine (2.5 g, 10.6 mmol), CuI (141 mg, 0.74 mmol), Pd(PPh3)4, (367 mg, 0.32 mmol) and 2- Methyl-3-butyn-2-ol (1.5 mL, 15.8 mmol) was added 1-methyl-2-pyrorolidone (20 mL) followed by Et3N (6 mL, 22 mmol). After stirring for 4 h 30 min at room temperature, the reaction mixture was poured into water (20 mL) and extracted with EtOAc (3 x 30 mL). The combined organic extracts were washed with brine (20 mL), dried (Na2SO4), filtered and concentrated under reduced pressure, and the residue was purified by flash column chromatography over silica gel (EtOAc/Hexanes, 2:98, then 5:95) to provide 4-(5-chloro-3-nitro-pyridin-2-yl)-2- methyl-but-3-yn-2-ol. MS m/z : 241.0 (M+H).
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,75806-86-9, its application will become more common.
Reference:
Patent; CHEMOCENTRYX, INC.; WO2006/76644; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem