Diethyl Ether → {2-[2-(2-[Bis{4-methoxybenzyl}amino]-6-chloro-5-methyl-3-nitropyridin-4-ylamino)ethoxy]ethyl}carbamic acid tert-butyl ester

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A solution of trifluoromethanesulfonic acid 4-[(2-{2-[(tert-butoxycarbonyl)amino]ethoxy}ethyl)amino]-6-chloro-5-methyl-3-nitropyridin-2-yl ester (14.3 g, 27.4 mmol), bis(4-methoxybenzyl)amine (7.00 g, 27.4 mmol), and triethylamine (3.82 mL, 27.4 mmol) in toluene (250 mL) was heated at 90° C. for two hours and then allowed to cool to room temperature overnight. Diethyl ether (300 mL) was added, and the solution was washed with water (200 mL) and brine (200 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was purified twice by column chromatography on silica gel (eluting sequentially with 80:20 hexanes:ethyl acetate and 70:30 hexanes:ethyl acetate) to provide 8.73 g of {2-[2-(2-[bis{4-methoxybenzyl}amino]-6-chloro-5-methyl-3-nitropyridin-4-ylamino)ethoxy]ethyl}carbamic acid tert-butyl ester.

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