T=90°C; 3 h;

1: NEt3 / diethyl ether / 0.33 h / -10 °C 2: 65 percent / 3 h / 90 °C View Scheme

lithium diisopropyl amide 1.) THF, - 78 deg C, 30 min, 2.) - 78 deg C, 1 h; room temp., 1 h; Yield given. Multistep reaction. Yields of byproduct given;