trimethylaluminum in tetrahydrofuran; toluene T=0 - 20°C; 2 h; Title compound not separated from byproducts;

1: (4R)-3-[(2R,3R)-3-hydroxy-5-phenyl-2-(phenylmethoxy)pentanoyl]-4-benzyl-1,3-oxazolidin-2-one; O,N-dimethyl-hydroxylamine hydrochloride With trimethylaluminum in tetrahydrofuran; toluene T=0 - 20°C; 2 h; 2: tert-butylchlorodiphenylsilane With 1H-imidazole in N,N-dimethyl-formamide T=20°C; 27 h;