Anaesthaminol → Ethyl 2-(3-chloropropyl)-5-benzoxazolecarboxylate
反応式
[NH2:1][C:2]1[CH:3]=[C:4]([CH:10]=[CH:11][C:12]=1[OH:13])[C:5]([O:7][CH2:8][CH3:9])=[O:6].Cl.[Cl:15][CH2:16][CH2:17][CH2:18][C:19](=N)OCC>ClC(Cl)Cl>[Cl:15][CH2:16][CH2:17][CH2:18][C:19]1[O:13][C:12]2[CH:11]=[CH:10][C:4]([C:5]([O:7][CH2:8][CH3:9])=[O:6])=[CH:3][C:2]=2[N:1]=1参加物
4
反応条件
- 温度
- 20 °C
実験手順
A mixture of 9 parts of ethyl 3-amino-4-hydroxybenzoate, 10.2 parts of ethyl 4-chlorobutanimidate hydrochloride and 150 parts of trichloromethane was stirred for 24 hours at 20° C. The separated organic layer was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The eluent of the desired fraction was evaporated, yielding 10 parts (74.7%) of ethyl 2-(3-chloropropyl)-5-benzoxazolecarboxylate as a residue (interm. 25).