反应详情

To a solution of 9.40 g (39.8 mmol) of the product obtained in Step B above in 300 ml of toluene there are added 150 mg of para-toluenesulphonic acid and the reaction mixture is heated at reflux, using a Dean-Stark system, for 12 hours. The title product is obtained after evaporating off the toluene using a rotary evaporator.

1. temperaturethe reaction mixture is heated
2. temperatureat reflux