n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.25 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: (L)-3-tert.butoxycarbonyl-2,2-dimethyl-oxazolidine-4-carboxylic acid-N-methoxy-N-methyl-amide With lithium aluminium tetrahydride in tetrahydrofuran T=20°C; 0.5 h; Inert atmosphere; 2: (1-Diazo-2-oxo-propyl)-phosphonic acid dimethyl ester in methanol T=0°C; 0.5 h; Inert atmosphere; 3: With potassium carbonate in methanol T=20°C; 15 h; Inert atmosphere;

ethylmagnesium bromide; triphenylphosphine THF; Multistep reaction;

quinoline; Lindlar's catalyst; hydrogen in ethanol T=20°C; Inert atmosphere;