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: 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: BF3*OEt2 / tetrahydrofuran / Ambient temperature View Scheme

boron trifluoride diethyl etherate in tetrahydrofuran Ambient temperature; Title compound not separated from byproducts;

1: 1.) n-BuLi / 1.) THF, 0 deg C, 1 h; 2.) 1 h 2: 1) Li-naphthalenide / 1) THF, 4 h, -78 deg C; 2) r.t. View Scheme

Li-naphthalenide 1) THF, 4 h, -78 deg C; 2) r.t.; Yield given. Multistep reaction;