条件:Stage #1: With sodium hydride In ethyl acetate; N,N-dimethyl-formamide; toluene at 80℃ for 10 h;Stage #2: With sulfuric acid In water at 110℃ for 2 h;Stage #3: With potassium carbonate In water;产率65%。
条件:Stage #1: With sodium hydride In N,N-dimethyl-formamide; toluene at 80℃ for 10 h;Stage #2: With sulfuric acid In water at 110℃ for 2 h;Stage #3: With potassium carbonate In water;产率65%。