Cl[CH2:2][C:3]1[N:4]=[N:5][C:6]2[C:7](=[C:9]([NH2:14])[N:10]=[C:11]([NH2:13])[N:12]=2)[N:8]=1.[NH:15]1[CH2:20][CH2:19][O:18][CH2:17][CH2:16]1>>[N:15]1([CH2:2][C:3]2[N:4]=[N:5][C:6]3[C:7](=[C:9]([NH2:14])[N:10]=[C:11]([NH2:13])[N:12]=3)[N:8]=2)[CH2:20][CH2:19][O:18][CH2:17][CH2:16]1A mixture of 3-Chloromethyl-pyrimido[5,4-e][1,2,4]triazine-5,7-diamine 3 (200 mg; 0.95 mmol) and 2.0 mL of morpholine were heated to 80° C. in a sealed tube for 7 h. The mixture was then allowed to cool to room temperature and concentrated in vacuo. The crude product was purified by reverse phase HPLC (Rainin C18, 0% CH3CN to 30% CH3CN gradient, CH3CN/H2O, 0.1% TFA) and the bright yellow fractions containing the product were lyophilized after removal of CH3CN in vacuo to give 261 mg of yellow colored 3-Morpholin-4-ylmethyl-pyrimido[5,4-e][1,2,4]triazine-5,7-diamine as the trifluoroacetate salt.
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