反应详情

A 4M solution of HCl in dioxane (2 mL) was added to a stirred solution of tert-butyl (2-(3-isopropylureido)-4-(thiophen-2-yl)phenyl)carbamate (0.15 g, 0.40 mmol, 1 equiv.) in methanol (4 mL) at 0° C. The reaction was warmed to room temperature and stirred for 2 h. The reaction was then concentrated under reduced pressure. A saturated aqueous solution of sodium bicarbonate was added. The obtained solid was filtered, washed with water and dried to yield 1-(2-amino-5-(thiophen-2-yl)phenyl)-3-isopropylurea (0.10 g, 91% yield). ESI+ MS: m/z 276 ([M+H]+), 1H NMR (500 MHz, d6-DMSO): δ 7.67 (d, J=2.0 Hz, 1H), 7.47 (s, 1H), 7.33 (d, J=5.0 Hz, 1H), 7.17 (d, J=3.0 Hz, 1H), 7.09 (dd, J=1.5, 8.0 Hz, 1H), 7.05-7.01 (m, 1H), 6.72 (d, J=8.0 Hz, 1H), 6.08 (d, J=8.0 Hz, 1H), 4.87 (s, 2H), 3.76 (sept, J=7.0 Hz, 1H), 1.10 (d, J=7.0 Hz, 6H).

1. concentrationThe reaction was then concentrated under reduced pressure
2. additionA saturated aqueous solution of sodium bicarbonate was added
3. filtrationThe obtained solid was filtered
4. washwashed with water
5. customdried