Thiourea → Ethyl 2-amino-4-(propan-2-yl)-1,3-thiazole-5-carboxylate
反応式
Cl[CH:2]([CH2:8][CH:9]([CH3:11])[CH3:10])[C:3]([O:5][CH2:6][CH3:7])=[O:4].[NH2:12][C:13]([NH2:15])=[S:14]>C(O)C>[NH2:15][C:13]1[S:14][C:2]([C:3]([O:5][CH2:6][CH3:7])=[O:4])=[C:8]([CH:9]([CH3:11])[CH3:10])[N:12]=1参加物
4
実験手順
Utilizing the procedure of Example 1, a mixture of 1.97 g (0.01 mol) of ethyl 2-chloro-4-methyl-pentanoate, 0.76 g (0.01 mol) of thiourea and 30 ml of ethanol was held at reflux for 18 hours. Ethanol was removed under reduced pressure. The residue was crystallized from hexane. The solid precipitates were dissolved in ether. The ether solution was washed with water, dried over magnesium sulfate and concentrated under reduced pressure. The residue was recrystallized from benzene-ether to give 0.85 g (39.6%) of ethyl 2-amino-4-isopropyl-5-thiazolecarboxylate, m.p. 173°-176° C.