[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 was allowed to stir at room temperature overnight. After LCMS showed the desired product mass as the dominant peak, the reaction was partitioned between water and ethyl acetate. The organic layer was washed once with brine before drying over sodium sulfate, filtering, and condensing. After drying, 4-((1R,3S)-3-hydroxycyclohexylamino)-2-(methylthio)-pyrimidine-5-carboxamide (4.19 g, 14.84 mmol, 93% yield) was obtained as an off-white solid; MS (ESI) m/z 283.2 [M+1]+
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