Methyl iodide → ethyl 3-(N-benzyloxycarbonyl-N-methylamino)propionate

Beteiligte Stoffe

Reaktionsschritte

To a suspension of sodium hydride (1.92 g, 60% in Oil) in a mixture of tetrahydrofuran (200 ml) and N,N-dimethylformamide (50 ml) was added dropwise ethyl 3-(benzyloxycarbonylamino)propionate (10 g) at 30° C. under nitrogen atmosphere, which was stirred for 30 minutes. To the reaction mixture was added methyl iodide (3 ml) and stirred for additional 6 hours. To the resulting mixture was added carefully water (5 ml), which was poured into a mixture of ethyl acetate (500 ml), n-hexane (150 ml) and water (100 ml). Organic layer was separated, washed in turn with water (100 ml×3), 1N-aqueous hydrochloric acid (100 ml), brine (100 ml), saturated sodium hydrogen carbonate in water (100 ml) and brine (100 ml×2), and dried over magnesium sulfate. Evaporation of the solvent gave a residue, which was chromatographed on silica gel (250 ml) eluting in turn with n-hexane, 10%, 50% ethyl acetate in n-hexane to give ethyl 3-(N-benzyloxycarbonyl-N-methylamino)propionate (8.32 g).

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