Br[CH2:2][CH2:3][CH2:4][NH:5][C:6]1[CH:11]=[C:10]([Cl:12])[N:9]=[C:8](Cl)[N:7]=1.C(=O)([O-])[O-:15].[K+].[K+]>O1CCOCC1.O>[Cl:12][C:10]1[CH:11]=[C:6]2[NH:5][CH2:4][CH2:3][CH2:2][N:7]2[C:8](=[O:15])[N:9]=1To a solution of N-(3-bromopropyl)-2,6-dichloropyrimidin-4-amine (2.0 g, 7.02 mmol) in 1,4-dioxane (15 mL) and water (15 mL) was added potassium carbonate (2.0 g, 14.47 mmol), stirred for 2 h at 60° C. and then concentrated. The residue was neutralized to pH˜6 by hydrochloride solution (6M), extracted by ethyl acetate to remove byproduct, and then neutralized by sodium hyroxide (2M) to pH˜7. The water was removed in vacuum to afford the title compound (3.03 g).
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