[Br:1][C:2]1[CH:13]=[N:12][C:5]2[NH:6][C:7](=[O:11])[CH2:8][NH:9][CH2:10][C:4]=2[CH:3]=1.[C:14]([O:18][C:19](=[O:22])[CH2:20]Br)([CH3:17])([CH3:16])[CH3:15].C(N(CC)CC)C>CN(C=O)C.O>[C:14]([O:18][C:19](=[O:22])[CH2:20][N:9]1[CH2:10][C:4]2[CH:3]=[C:2]([Br:1])[CH:13]=[N:12][C:5]=2[NH:6][C:7](=[O:11])[CH2:8]1)([CH3:17])([CH3:16])[CH3:15]A solution of 7-bromo-1,3,4,5-tetrahydro-pyrido[2,3-e][1,4]diazepin-2-one (2.29 g, 9.46 mmol) in DMF (100 mL) was treated with tert-butylbromoacetate (1.7 mL, 12 mmol) and triethylamine (1.5 mL, 11 mmol). After stirring at room temperature overnight, the mixture was diluted with H2O (300 mL) and then extracted with EtOAc (3×200 mL). The combined organic layers were washed with H2O (3×100 mL) and brine (100 mL), dried over Na2SO4, filtered and the solvent was removed in vacuo. Purification by flash column chromatography (silica gel, hexanes/EtOAc, 2:1) gave the title compound (1.61 g, 48%) as a white powder: MS (ESI) t/e 356 (M+H)+.
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