反应详情

A mixture of 2-bromo-1-(p-tolyl)propan-1-one (6.88 g, 30.3 mmol) and thiourea (2.54 g, 33.4 mmol) in 95% EtOH (43 mL) was heated at reflux for 60 min. The solution was concentrated and added with water (100 mL) and saturated aqueous Na2CO3 (5.0 mL). The resultant precipitate was filtered and recrystallized in toluene. The solids were filtered and dried under vacuum to give 5-methyl-4-(p-tolyl)thiazol-2-amine (6.10 g) as white solids in 99% yield: 1H NMR (500 MHz, CDCl3) δ 7.40 (d, J=8.0 Hz, 2 H), 7.23 (d, J=8.0 Hz, 2 H), 3.18 (bs, 2 H), 2.37 (s, 3 H), 2.35 (s, 3 H).

1. temperaturewas heated
2. temperatureat reflux for 60 min
3. concentrationThe solution was concentrated
4. additionadded with water (100 mL) and saturated aqueous Na2CO3 (5.0 mL)
5. filtrationThe resultant precipitate was filtered
6. customrecrystallized in toluene
7. filtrationThe solids were filtered
8. customdried under vacuum