Reaction Steps
To a solution of 2-[4-(4-hydroxy-butyl)-benzylamino]-3-methyl-chromen-4-one (100 mg, 0.30 mmol) in dichloromethane (37 mL) was added p-toluenesulfonylchloride (68 mg, 0.36 mmol), dimethylaminopyridine (43.4 mg, 0.36 mmol), and triethylamine (62 μL, 0.44 mmol) in a 0° C. ice bath. The reaction slurry stirred overnight under N2 atmosphere, warming to room temperature slowly overnight. The next day, the reaction mixture was concentrated and purified by flash column chromatography (3:1→1:1 Hexane:ethyl acetate→100% ethyl acetate) to obtain the product as an oil (45 mg, 31% yield). 1H NMR (600 MHz, CDCl3): δ 8.19 (dd, 1H, J=1.5 and 7.9 Hz), 7.76 (d, 2H, J=8.3 Hz), 7.76 (m, 1H), 7.32 (d, 2H, J=7.9 Hz), 7.29 (d, 2H, J=8.1 Hz), 7.26 (d, 2H, J=8.0 Hz), 7.13 (d, 2H, J=8.0 Hz), 4.90 (t, 1H, J=5.1 Hz), 4.64 (d, 2H, J=5.6 Hz), 4.02 (t, 2H, J=5.9 Hz), 2.57 (t, 2H, J=7.3 Hz), 2.43 (s, 3H), 1.96 (s, 3H), 1.65 (m, 4H); 13C NMR (150 MHz, CDCl3): δ 174.9, 160.2, 152.8, 144.7, 141.5, 135.4, 133.1, 131.4, 129.8, 128.9, 127.9, 127.7, 125.9, 124.6, 122.8, 116.2, 93.4, 70.3, 45.5, 34.7, 28.4, 27.1, 21.6, 7.6.
