[OH:1][C@H:2]1[CH2:7][CH2:6][CH2:5][C@@H:4]([NH:8][C:9]2[C:14]([C:15](O)=[O:16])=[CH:13][N:12]=[C:11]([S:18][CH3:19])[N:10]=2)[CH2:3]1.C[N:21](C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.[Cl-].[NH4+].CCN(C(C)C)C(C)C>CN(C=O)C>[OH:1][C@H:2]1[CH2:7][CH2:6][CH2:5][C@@H:4]([NH:8][C:9]2[C:14]([C:15]([NH2:21])=[O:16])=[CH:13][N:12]=[C:11]([S:18][CH3:19])[N:10]=2)[CH2:3]14-((1R,3S)-3-hydroxycyclohexylamino)-2-(methylthio)pyrimidine-5-carboxylic acid (4.5 g, 15.88 mmol) and HATU (9.06 g, 23.82 mmol) were dissolved in DMF (75 ml) and allowed to stir for 5 min at room temperature before adding ammonium chloride (4.25 g, 79 mmol) and DIEA (13.87 ml, 79 mmol). The reaction turned yellow upon addition of the base. The reaction was allowed to stir at room temperature for 1 h then partitioned between water and ethyl acetate. The organic layer was washed once with brine before drying over sodium sulfate, filtering, and concentrating to afford 4-((1R,3S)-3-hydroxycyclohexylamino)-2-(methylthio)pyrimidine-5-carboxamide (4.19 g, 14.84 mmol, 93% yield) as an off-white solid. MS (ESI) m/z 283.2 [M+1]+.
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