[Br:1][C:2]1[C:3]([Cl:10])=[N:4][C:5]([NH2:9])=[N:6][C:7]=1Cl.C(N(CC)CC)C.[NH2:18][CH2:19][CH2:20][NH:21][C:22](=[O:28])[O:23][C:24]([CH3:27])([CH3:26])[CH3:25]>CN(C=O)C>[NH2:9][C:5]1[N:6]=[C:7]([NH:18][CH2:19][CH2:20][NH:21][C:22](=[O:28])[O:23][C:24]([CH3:26])([CH3:25])[CH3:27])[C:2]([Br:1])=[C:3]([Cl:10])[N:4]=1A stirred solution of 5-bromo-4,6-dichloropyrimidin-2-amine (Reference Example 1, 14.00 g, 0.0576 mole), and triethylamine (41.8 mL, 0.2997 mole) in DMF (55 mL) was treated with tert-butyl 2-aminoethylcarbamate (9.24 g, 0.0576 mole). The reaction mixture was stirred at ambient temperature for 18 hours, then volatiles were removed under reduced pressure and the residue was partitioned between ethyl acetate and saturated aqueous sodium carbonate. The organic layer was dried (MgSO4) and filtered. The filtrate was concentrated under reduced pressure to give a yellow solid that was triturated with ether to remove color. The ether-insoluble material was collected by filtration and dried under vacuum to provide tert-butyl 2-(2-amino-5-bromo-6-chloropyrimidin-4-ylamino)ethylcarbamate (18.02 g, 85.2% yield). 1H NMR (300 MHz, CD3OD) δ ppm 1.42 (s, 9H), 3.25 (t, J=6 Hz, 2H), 3.47 (t, J=6 Hz, 2H). MS (DCl—NH3) m/z=366 (M+H)+.
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