copper(l) iodide; n-butyllithium; 2-(dimethylamino)-ethanol in tetrahydrofuran; hexane 1.) 0 deg C, 1 h, 2.) 0 deg C;

1: BuLi / -78 °C 2: 62 percent / n-BuLi, Me2N(CH2)2OH, CuI / hexane; tetrahydrofuran / 1.) 0 deg C, 1 h, 2.) 0 deg C View Scheme