[Cl:1][C:2]1[N:7]=[C:6]([NH:8][CH3:9])[N:5]=[C:4]([N:10]2[CH2:15][CH2:14][CH:13]([C:16]([O:18]CC)=[O:17])[CH2:12][CH2:11]2)[N:3]=1.O.[OH-].[Li+].O.CO>O1CCCC1.C(OCC)(=O)C>[Cl:1][C:2]1[N:7]=[C:6]([NH:8][CH3:9])[N:5]=[C:4]([N:10]2[CH2:15][CH2:14][CH:13]([C:16]([OH:18])=[O:17])[CH2:12][CH2:11]2)[N:3]=1To a solution of ethyl 1-[4-chloro-6-(methylamino)-1,3,5-triazin-2-yl]-4-piperidinecarboxylate (983 mg, 3.28 mmol, 1.00 equiv) in tetrahydrofuran (21 ml) at 0° C., a premixed solution of lithium hydroxide monohydrate (275 mg, 6.56 mmol, 2.00 equiv) and water (7 ml) was added dropwise. Methanol (7 ml) was added. The reaction was allowed to warm to room temperature over 1 h and stirring was continued for 3 h. The solvent was removed under reduced pressure, yielding a colorless oil. Ethyl acetate was added to the oil, and the desired product precipitated as a white solid. The solid was filtered and dried under reduced pressure to provide 885 mg (99%) of the title compound. MS (ES+): m/e 272.0 [M+H]+.
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