[Cl:1][C:2]1[N:3]=[N:4][CH:5]=[C:6](Cl)[N:7]=1.C(N(C(C)C)CC)(C)C.[C:18]([N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1)([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19].C(OCC)(=O)C>O1CCOCC1>[C:18]([N:25]1[CH2:26][CH2:27][N:28]([C:6]2[N:7]=[C:2]([Cl:1])[N:3]=[N:4][CH:5]=2)[CH2:29][CH2:30]1)([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19]To a solution of 3,5-dichloro[1,2,4]triazine (0.34 g, 2.28 mmol.) in anhydrous dioxane (4 mL) was add diisopropylethylamine (0.44 g, 3.41 mmol.) and N—Boc-piperazine (0.424 g, 2.28 mmol.). The reaction mixture was stirred at room temperature for 40 minutes. Ethyl acetate (200 mL) was added. The organic solution was washed with saturated ammonium chloride solution, water and brine. The organic layer was dried over sodium sulfate. The organic solvent was evaporation under reduced pressure. The crude product was purified by RP-HPLC to yield the desired 5-(4-Boc-piperazin-1-yl)-3-chloro[1,2,4]triazine 151 (0.212 g, 0.71 mmol.).
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