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17.5 mg of 3-[1-(4-amino-benzyl)-2-oxo-1,2,5,6-tetrahydro-pyridin-3-yl]-propionic acid methyl ester (h) prepared by above Step 1 was dissolved in methylene chloride solution (0.06 mM). And then 6 μl of (AcO)2O (0.07 mM), 0.01 ml of triethylamine (0.08 mM) and 1.0 mg of DMAP (0.008 mM) were added thereto and the mixture was stirred for 3 hrs at 0° C. The reaction was stopped by adding methanol and the mixture was extracted three times with 10 ml of ethyl acetate. The organic layer was washed with saturated NaCl solution, dried over anhydrous MgSO4, filtered and concentrated in vacuo. The resulting compound was purified with Silica gel column chromatography with ethylacetate as an eluant to give 46 mg of 3-[1-(4-acetylamino-benzyl)-2-oxo-1,2,5,6-tetrahydro-pyridin-3-yl)-propionic acid methyl ester (i) (yield: 44%).

1. extractionthe mixture was extracted three times with 10 ml of ethyl acetate
2. washThe organic layer was washed with saturated NaCl solution
3. dry with materialdried over anhydrous MgSO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe resulting compound was purified with Silica gel column chromatography with ethylacetate as an eluant