1: (S)-4-(4-{5-[(benzylidene-amino)-methyl]-2-oxo-oxazolidine-3-yl}-phenyl)-morpholin-3-one With hydrogenchloride in water; ethyl acetate T=20°C; 2 h; 2: 5-chloro-2-thiophenecarbonyl chloride With sodium hydroxide in dichloromethane; water T=20°C; 2 h;