[H-].[Na+].[CH:3]1([OH:7])[CH2:6][CH2:5][CH2:4]1.Cl[C:9]1[N:14]=[CH:13][N:12]=[C:11]([N:15]2[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]2)[CH:10]=1>CN(C=O)C>[CH:3]1([O:7][C:9]2[N:14]=[CH:13][N:12]=[C:11]([N:15]3[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]3)[CH:10]=2)[CH2:6][CH2:5][CH2:4]1To a suspension of sodium hydride (60% in mineral oil, 469 mg, 11.7 mmol) in DMF (15 mL) was added cyclobutanol (0.92 ml, 11.7 mmol) at 0° C. After stirring at 0° C. for 30 min, a solution of tert-butyl 4-(6-chloropyrimidin-4-yl)piperazine-1-carboxylate (700 mg, 2.34 mmol) in DMF (0.5 mL) was slowly added, and the mixture was stirred at rt for 12 h. Then, the mixture was poured onto water, and the aqueous layer was extracted with EtOAc (twice). The combined organic layer was dried over sodium sulfate and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane/EtOAc (5:1-3:1) to give 687 mg (88% yield) of the title compound as a white solid.
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