反应详情

1,2-Diamino-1-phenylethane prepared as in Example 31B (5.0 g, 37.5 mmol) was dissolved in water (110 ml), and sodium hydroxide (3.0 g, 75 mmol) was added in small portions. After stirring for 10 min, p-toluenesulfonyl chloride (14.31 g, 75.1 mmol) was added and stirring was continued for 1 h. Ether (225 ml) was added and the reaction mixture was stirred overnight at room temperature. A white solid precipitated out during this time. The solid was filtered, washed with ether, and dried (13 g). Recrystallization from dichloromethane-hexane gave 12.17 g (73% yield) of a white solid: mp 148°-9° C.; 1H NMR (CDCl3) δ 2.39 (s, 3 H), 2.43 (s, 3 H), 3.19 (m, 2 H), 4.31 (dd, J=12.2, 6.8 Hz, 1 H), 4.77 (t, J=6.6, 1 H), 5.32 (d, J=6.7, 1 H), 6.98 (m, 2 H), 7.19 (m, 5 H), 7.27 (d, J=5.9, 2 H), 7.59 (d, J=8.3 Hz, 2 H), 7.68 (d, J=8.3 Hz, 2 H).

1. stirringstirring
2. waitwas continued for 1 h
3. stirringthe reaction mixture was stirred overnight at room temperature
4. customA white solid precipitated out during this time
5. filtrationThe solid was filtered
6. washwashed with ether
7. customdried (13 g)
8. customRecrystallization from dichloromethane-hexane