1: 43 percent / trifluoroacetic acid, water / CH2Cl2 / Ambient temperature 2: 49 percent / p-toluenesulfonic acid monohydrate, molecular sieves type 4A / light petroleum; toluene / 24 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 43 percent / trifluoroacetic acid, water / CH2Cl2 / Ambient temperature2: 33 percent / p-toluenesulfonic acid monohydrate, molecular sieves type 4A / light petroleum; toluene / 24 h / Heating  

With  water; trifluoroacetic acid in  dichloromethane  Ambient temperature;