1: 96 percent / K2CO3 / acetone / 0.5 h / 80 °C 2: 10 percent / N,N-dimethyl-acetamide / 6 h / 200 °C 3: 73 percent / m-chloroperbenzoic acid (MCPBA) / diethyl ether / 6 h 4: 92 percent / p-toluenesulfonic acid / 2 h View Scheme

1: 96 percent / K2CO3 / acetone / 0.5 h / 80 °C 2: 10 percent / N,N-dimethyl-acetamide / 6 h / 200 °C View Scheme

1: 96 percent / K2CO3 / acetone / 0.5 h / 80 °C 2: 10 percent / N,N-dimethyl-acetamide / 6 h / 200 °C 3: 73 percent / m-chloroperbenzoic acid (MCPBA) / diethyl ether / 6 h View Scheme

1: 96 percent / K2CO3 / acetone / 0.5 h / 80 °C 2: 46 percent / N,N-dimethyl-acetamide / 6 h / 200 °C View Scheme

With  sodium hydroxide in  methanol  Ambient temperature;