[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([C:10]([CH:12]3[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]3)=[O:11])=[CH:9][C:4]=2[CH2:3][CH2:2]1.Br[CH2:19][C:20]([O:22][CH2:23][CH3:24])=[O:21].C(N(CC)CC)C>C(#N)C>[CH2:23]([O:22][C:20](=[O:21])[CH2:19][N:15]1[CH2:14][CH2:13][CH:12]([C:10]([C:8]2[CH:7]=[CH:6][C:5]3[O:1][CH2:2][CH2:3][C:4]=3[CH:9]=2)=[O:11])[CH2:17][CH2:16]1)[CH3:24]To a solution of (2,3-dihydro-benzofuran-5-yl)-piperidin-4-yl-methanone (0.30 g, 1.30 mmol) in acetonitrile (10 mL) was added ethyl 2-bromoacetate (0.26 g, 1.6 mmol) and triethylamine (0.66 g, 6.5 mmol). The mixture was heated at 85° C. overnight, the solvent was evaporated under reduced pressure and purified via flash column chromatography (ethyl acetate:heptane) to provide desired product as a white solid (0.18 g, 0.54 mmol). MS (ESI) m/z 317.8 (M+H+); HPLC (Novapak 150×3.9 mm C-18 column: mobile phase: 35-90% acetonitrile/water with 0.1% TFA, at 2 mL/min over 2 min.) t 1.22 min.
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