Cl.[NH2:2][C@@H:3]1[CH2:8][CH2:7][CH2:6][CH2:5][C@H:4]1[OH:9].C(=O)([O-])[O-].[K+].[K+].[Cl:16][C:17]1[N:22]=[C:21](Cl)[C:20]([Cl:24])=[CH:19][N:18]=1>O1CCCC1>[Cl:16][C:17]1[N:22]=[C:21]([NH:2][C@@H:3]2[CH2:8][CH2:7][CH2:6][CH2:5][C@H:4]2[OH:9])[C:20]([Cl:24])=[CH:19][N:18]=1Tetrahydrofuran (100 mL) was added to racemic trans-2-amino-cyclohexanol hydrochloride (4.28 g, 28.2 mmol) and potassium carbonate (12.1 g, 88 mmol). The mixture was cooled at 0° C. before 2,4,5-trichloropyrimidine (2 mL, 17.4 mmol) was added. After 3 hours, the mixture was partitioned between water and ethyl acetate, the aq. layer was extracted and the combined extracts were dried and conc. in vacuo. The crude product was taken up in ethyl acetate and washed with 10% w/v citric acid, then with sodium bicarbonate, dried over sodium sulfate and conc. in vacuo to give rel-(1R,2R)-2-(2,5-dichloro-pyrimidin-4-ylamino)-cyclohexanol (2.27 g, 50%) as a white solid. m.p.=139-142° C.; LCMS (m/e) 262 (M+1); 1H-NMR (DMSO-d6, 400 MHz) δ 8.12 (s, 1H), 7.45 (m, 1H), 68 (m, 1H), 3.81 (m, 1H), 3.55 (m, 1H), 1.92 (m, 1H), 1.81 (m, 1H), 1.67 (m, 2H), 1.41 (m, 1H), 1.26 (m, 3H).
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