1: (S)-N-benzyl-α-methylbenzylamine With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: tert-butyl cinnamate in tetrahydrofuran; hexane T=-78°C; 2 h; 3: (S)-4-benzyl-3-(6-(benzyloxy)hex-2-enoyl)oxazolidin-2-one in tetrahydrofuran; hexane T=-78 - 0°C; 2 h; Further stages.;

copper(l) iodide; methyllithium; diisobutylaluminium hydride in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide; diethyl ether; cyclohexane T=-78°C; 1.16667 h; Inert atmosphere; regioselective reaction;