Water → 2-isobutyl-N,N-bis(4-methoxybenzyl)imidazo[1,2-a]quinoxalin-4-amine

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To a solution of the 4-chloro-2-isobutylimidazo[1,2-a]quinoxaline (130 mg, 0.50 mmol) in 2 mL of 1-methylpyrrolidin-2-one was added N,N-diisopropylethylamine (129 mg, 1.0 mmol) and followed by bis(4-methoxybenzyl)amine (154 mg, 0.60 mmol). The reaction mixture was stirred at 120° C. overnight. And then 10 mL of water was added. The resulting mixture was extracted with ethyl ether (50 mL×3). The combined organic layers were washed with water (20 mL), brine (20 mL), dried over MgSO4, filtered and concentrated. The crude product was purified by flash column chromatography eluted with ethyl acetate and hexanes to give the titled compound (195 mg, 81%). MS: MH+=481 1H NMR (300 MHz, CDCl3): δ 7.72 (s, 1H), 7.65 (m, 2H), 7.21-7.39 (m, 6H), 6.84 (d, 4H), 5.34 (brs, 4H), 3.79 (s, 6H), 2.63 (d, 2H), 2.06 (m, 1H), 0.94 (d, 6H).

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