C(OC([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[CH:19]=[C:18]([O:20][CH3:21])[N:17]=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=O)(C)(C)C.[ClH:22]>O1CCOCC1>[ClH:22].[CH3:21][O:20][C:18]1[CH:19]=[C:14]([N:11]2[CH2:10][CH2:9][NH:8][CH2:13][CH2:12]2)[N:15]=[CH:16][N:17]=19.8 g 4-(6-methoxy-pyrimidin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester was stirred in 100 mL 4 mol/L HCl solution in dioxane for 4 h. The precipitate was filtered and dried to yield 8.1 g of the desired compound. Rt: 0.22 min (method B), (M+H)+: 195
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