1: N-ethyl-N,N-diisopropylamine; lithium chloride / acetonitrile / 4 h / Cooling with ice 2: copper(l) iodide; methyllithium; diisobutylaluminium hydride / tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide; diethyl ether; cyclohexane / 1.17 h / -78 °C / Inert atmosphere View Scheme