1: O,N-dimethyl-hydroxylamine hydrochloride With trimethylaluminum in tetrahydrofuran; toluene T=0 - 20°C; 2: (4S,5R)-3-((E)-(2R,3S)-3-Hydroxy-2,4-dimethyl-hept-4-enoyl)-4-methyl-5-phenyl-oxazolidin-2-one in tetrahydrofuran; toluene T=50°C; 1.5 h;