[CH2:1]([O:8][C:9]1[C:10]([C:30]([O:32][C:33]([CH3:36])([CH3:35])[CH3:34])=[O:31])=[N:11][C:12]([CH2:16][CH:17]2[CH2:22][CH2:21][N:20](C(OC(C)(C)C)=O)[CH2:19][CH2:18]2)=[N:13][C:14]=1[CH3:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[ClH:37].CCCCCC>C(OCC)(=O)C>[ClH:37].[CH2:1]([O:8][C:9]1[C:10]([C:30]([O:32][C:33]([CH3:36])([CH3:35])[CH3:34])=[O:31])=[N:11][C:12]([CH2:16][CH:17]2[CH2:22][CH2:21][NH:20][CH2:19][CH2:18]2)=[N:13][C:14]=1[CH3:15])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1tert-Butyl 5-(benzyloxy)-2-{[1-(tert-butoxycarbonyl)piperidin-4-yl]methyl}-6-methylpyrimidine-4-carboxylate (4.4 g, 8.8 mmol) was dissolved in ethyl acetate (44 mL), and a solution of hydrogen chloride in ethyl acetate (4 M, 68 mL, 270 mmol) was added, followed by stirring at room temperature for 3 hours. Hexane (100 mL) and ethyl acetate (100 mL) were added to the reaction solution, whereby a solid was deposited. The resulting solid was collected by filtration, and dried under reduced pressure to afford the title compound (3.7 g, 8.5 mmol) as a white solid (yield 95%).
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