boron trifluoride diethyl etherate in tetrahydrofuran Ambient temperature;

1: 1) BuLi / 1) THF, hexane, -78 deg C, 1 h, 2) THF, -78 deg C, 2 h, then rt, 15 h 2: 1) BuLi / 1) THF, hexane, -78 deg C, 1 h, 2) THF, -78 deg C, 2 h, then rt, 15 h 3: 85 percent / BF3*OEt2 / tetrahydrofuran / Ambient temperature View Scheme

1: 1) BuLi / 1) THF, hexane, -78 deg C, 1 h, 2) THF, -78 deg C, 2 h, then rt, 15 h 2: 85 percent / BF3*OEt2 / tetrahydrofuran / Ambient temperature View Scheme

1.) ether, TMEDA, 0 deg C, 2.5 h, 2.) ether, TMEDA; Yield given. Multistep reaction;

water in acetonitrile electrolysis at 1.10 V;