[NH2:1][CH2:2][CH:3]([C:5]1[CH:10]=[CH:9][C:8]([O:11][CH3:12])=[C:7]([O:13][CH3:14])[CH:6]=1)[OH:4].[C:15](Cl)(Cl)=[O:16].N1C=CC=CC=1>C(Cl)(Cl)Cl>[CH3:14][O:13][C:7]1[CH:6]=[C:5]([CH:3]2[O:4][C:15](=[O:16])[NH:1][CH2:2]2)[CH:10]=[CH:9][C:8]=1[O:11][CH3:12]100 mmol of 2-amino-1-(3,4-dimethoxyphenyl)-ethanol is dissolved in 100 ml. of chloroform. After cooling to 0°, a solution of 100 mmol of phosgene in 100 ml. of chloroform is added dropwise so slowly that the internal temperature does not rise above 5°. After one hour of agitation at 5°-10°, 200 mmol of pyridine in 100 ml. of chloroform is added dropwise to the reaction mixture, and the latter is stirred for 3 hours. After washing the organic phase in semisaturated NaCl solution, the mixture is concentrated by evaporation and recrystallized from methanol, thus obtaining in a 75% yield 5-(3,4-dimethoxyphenyl)-2-oxazolidinone, m.p. 114°-117°.
Wird geladen…
