CN(C)CCCN=C=NCC.[Br:12][C:13]1[CH:20]=[CH:19][CH:18]=[CH:17][C:14]=1[CH2:15][NH2:16].[CH2:21]([O:23][CH:24]([O:28][CH2:29][CH3:30])[C:25]([O-])=[O:26])[CH3:22].[Na+].O.ON1C2C=CC=CC=2N=N1.CCN(C(C)C)C(C)C>CN(C=O)C>[Br:12][C:13]1[CH:20]=[CH:19][CH:18]=[CH:17][C:14]=1[CH2:15][NH:16][C:25](=[O:26])[CH:24]([O:28][CH2:29][CH3:30])[O:23][CH2:21][CH3:22]1-[3-(Dimethylamino)propyl]-3-ethylcarbodiimide (1.15 g, 6.00 mmol) was added to a mixture of 2-bromobenzylamine (0.744 g, 4.00 mmol), sodium 2,2-diethoxyacetate (0.816 g, 4.80 mmol), 1-hydroxybenzotriazole hydrate (0.919 g, 6.00 mmol) and Hunig's base (1.53 mL, 8.80 mmol) in DMF (10 mL) with stirring. After 18 hours at room temperature, the mixture was partitioned between water and ethyl acetate. The organic layer was washed successively with 2 M HCl, saturated sodium bicarbonate solution and brine, then dried (Na2SO4) and concentrated to a viscous colourless oil (1.02 g, 81%). LC-MS (1) Rt==2.23 min; m/z (ESI+) 316 & 318 (M+H+).
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