反应详情

80 ml of isopropylamine are added to a solution of 18.0 g of crude 1-[2-(2,3-dihydro-2,2-dimethyl-4-oxo-4H-1,3-benzoxazin-6-yloxy)-1-methylethylamino]-3-(4-methylcarbamoylphenoxy)propan-2-ol in 300 ml of methanol and the solution is refluxed for 1 hour. The reaction mixture is concentrated by evaporation and the oil remaining is crystallised from 80 ml of isopropanol. 1-[2-(3-Carbamoyl-4-hydroxyphenoxy)-1-methylethylamino]-3-(4-methylcarbamoylphenoxy)propan-2-ol having a melting point of 172°-175° (diastereoisomeric mixture) is obtained.

1. temperaturethe solution is refluxed for 1 hour
2. concentrationThe reaction mixture is concentrated by evaporation
3. customthe oil remaining is crystallised from 80 ml of isopropanol