Electric Literature of 2402-78-0 , The common heterocyclic compound, 2402-78-0, name is 2,6-Dichloropyridine, molecular formula is C5H3Cl2N, 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.
A solution of n-BuLi (21.1 ml_, 33.8 mmol, 1.6 M) in THF is cooled to -78C before a solution of 2,6-dichloropyhdine (5.0 g, 33.8 mmol) in THF (36 ml_) is added dropwise over a period of 20 min. The reaction mixture is stirred at -78C for 30 min, and then iodomethane (4.79 g, 33.8 mmol) is added. The mixture is stirred for 30 min before it is quenched with sat. aq. NH4CI solution at -78C. The mixture is extracted with diethyl ether, the org. extract is dried over MgSO4, filtered and concentrated. The crude product is purified by CC on silica gel eluting with heptane:EA 19:1 to give 2,6-dichloro-4-methyl-pyridine (2.34 g) as a colourless oil containing the regio isomer 2,6-dichloro-3-methyl-pyhdine; LC-MS: tR = 0.89 min, [M+1]+ = 161.97.
The synthetic route of 2402-78-0 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; ACTELION PHARMACEUTICALS LTD; WO2009/24905; (2009); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem