boron trifluoride diethyl etherate in dichloromethane T=0 - 5°C; 2 h;

1: 1.) NaNH2, Et(OCH2CH2)2OH / 1.) THF, 2 h, 2.) THF 2: 87 percent / CuCl2, CuO / acetone; H2O / 0.5 h / 35 °C 3: 79 percent / BF3*OEt2 / CH2Cl2 / 2 h / 0 - 5 °C View Scheme

1: 87 percent / CuCl2, CuO / acetone; H2O / 0.5 h / 35 °C 2: 79 percent / BF3*OEt2 / CH2Cl2 / 2 h / 0 - 5 °C View Scheme