Triethylamine → (2-Chloro-6-methyl-3-nitropyridin-4-yl)-{2-[3-(pyridin-3-yl)propoxy]ethyl}amine

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Reaction Steps

Under a nitrogen atmosphere, triethylamine (6.1 mL, 44 mmol) was added to a solution of 2,4-dichloro-6-methyl-3-nitropyridine (7.50 g, 36.2 mmol), prepared as described in Part A of Example 1, in anhydrous DMF (160 mL). Neat 2-[3-(pyridin-3-yl)propoxy]ethylamine (6.60 g, 36.6 mmol) was then added, and the mixture was stirred at room temperature for 1.5 hours. The volatiles were then removed under reduced pressure, and the residue was dissolved in chloroform. The solution was washed with 2% aqueous potassium bicarbonate (1×), water (1×), and brine (1×), dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide an oil. The crude product was purified by column chromatography on silica gel (600 g, eluting with methanol:ethyl acetate in various ratios) to afford an oil which was dried under reduced pressure to yield 4.9 g of (2-chloro-6-methyl-3-nitropyridin-4-yl)-{2-[3-(pyridin-3-yl)propoxy]ethyl}amine.

Provenance & Evidence