[CH3:1][O:2][C:3](=[O:24])[CH2:4][CH2:5][C:6]1[C:7](=[O:23])[N:8](CC2C=CC(OC)=CC=2OC)[CH2:9][CH2:10][CH:11]=1.C([SiH](CC)CC)C>FC(F)(F)C(O)=O>[CH3:1][O:2][C:3](=[O:24])[CH2:4][CH2:5][C:6]1[C:7](=[O:23])[NH:8][CH2:9][CH2:10][CH:11]=1310 mg of 3-[1-(2,4-dimethoxybenzyl)-2-oxo-1,2,5,6-tetrahydro-pyridin-3-yl]-propionic acid methyl ester (d) (0.93 mmol) was dissolved in 3 ml of trifluoroacetic acid solution. Then 0.22 ml of triethyl silane (1.395 mmol) was added thereto and the mixture was heated for 20 min at 80° C. The solvent was removed in vacuo and the remaining residue was diluted in 20 ml of chloroform. The organic layer was washed with 5 ml of sat. NaHCO3 solution and 5 ml of sat. NaCl solution. Then the organic layer was dried over anhydrous MgSO4, filtered and concentrated in vacuo. The resulting compound was purified by column chromatography on Silica gel with EtOAc solvent as an eluant to give 126 mg (yield: 55%) of the title compound (f).
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