1: 85 percent / 80 percent aq.acetic acid 2: 97 percent / Et3N / CH2Cl2 View Scheme

With  acetic acid  

Multi-step reaction with 3 steps 1: 85 percent / 80 percent aq.acetic acid2: 97 percent / Et3N / CH2Cl2 3: cesium carbonate / dimethylformamide / 2 h / 90 °C  

Multi-step reaction with 4 steps 1: 85 percent / 80 percent aq.acetic acid2: 97 percent / Et3N / CH2Cl2 3: 67 percent / cesium carbonate / dimethylformamide / 2 h / 90 °C4: 65 percent / H2 / Pd(OH)2 on carbon / ethanol; cyclohexane / Heating