反应详情

To a solution of 2-furan-2-yl-6-piperazin-1-yl-[1,2,4]triazolo[1,5-a]pyrazin-8-ylamine in methylene chloride (see Example 16 above) was added 2,4,6-trifluorobenzaldehyde (28 mg, 0.18 mmol), sodium triacetoxyborohydride (46 mg, 0.22 mmol) and acetic acid (6 μL, 0.1 mmol). The reaction was stirred at room temperature for overnight. After the solvent was removed, the residue was subjected to flash chromatography (ethyl acetate/hexanes=30:70, 40:60) to afford 2-furan-2-yl-6-[4-(2,4,6-trifluoro-benzyl)-piperazin-1-yl]-[1,2,4]triazolo[1,5-a]pyrazin-8-ylamine as a white solid (35 mg, 56%). 1H NMR (300 MHz, CDCl3) δ2.66 (t, J=4.5 Hz, 4H), 3.34 (t, J=4.5 Hz, 4H), 3.73 (s, 2H),5.61 (s, 2H), 6.54 (dd, J=1.8, 3.6 Hz, 1H), 6.67 (d, J=7.8 Hz, 1H), 6.70 (d, J=7.8 Hz, 1H), 7.07 (d, J=3.6 Hz, 1H), 7.26 (s, 1H), 7.57 (d, J=1.8 Hz, 1H); 13C NMR (100 MHz, CDCl3) δ46.53, 48.35, 51.56, 95.63, 99.82, 100.10, 100.38, 110.29, 111.73, 134.80, 143.80, 146.00, 146.42, 149.06, 155.13.

1. customAfter the solvent was removed