2,2,2-Trifluoroethanol → HCID 66802980, compound

Participants

Reaction Steps

To a solution of [5-(3-{4-amino-6-[(2-methoxy-ethyl)-phenyl-amino]-[1,3,5]triazin-2-yl}-[1,2,4]oxadiazol-5-yl)-pyridin-2-yl]-methanol (Intermediate 130, 185 mg, 0.44 mmol) in DCM (40 mL) was added methanesulfonyl chloride (48 μL, 0.61 mmol) drop-wise, followed by triethylamine (92 μL, 0.66 mmol). The resulting solution was stirred for 3 h under an inert atmosphere. Incomplete reaction was observed so additional methanesulfonyl chloride (9 μL, 0.10 mmol) and triethylamine (16 μL, 0.11 mmol) were added and stirring was continued for 1 h. The reaction mixture was washed with water (2×50 mL) and the organic phase dried over magnesium sulfate and evaporated to dryness to afford the methanesulfonic acid 5-(3-{4-amino-6-[(2-methoxy-ethyl)-phenyl-amino]-[1,3,5]triazin-2-yl}-[1,2,4]oxadiazol-5-yl)-pyridin-2-ylmethyl ester intermediate. In a separate flask 2,2,2-trifluoro-ethanol (190 μL, 2.64 mmol) was added dropwise to a suspension of sodium hydride (60% dispersion in mineral oil, 97 mg, 2.42 mmol) in anhydrous THF (30 mL) at 0 C under nitrogen. The resulting solution was stirred at 0 C for 30 min and then transferred via cannula to a solution of the methanesulfonic acid 5-(3-{4-amino-6-[(2-methoxy-ethyl)-phenyl-amino]-[1,3,5]triazin-2-yl}-[1,2,4]oxadiazol-5-yl)-pyridin-2-ylmethyl ester intermediate (220 mg, 0.44 mmol) in anhydrous THF (30 mL) at 0 C drop wise. The reaction mixture was stirred at room temperature for 18 h. The reaction was quenched with a saturated ammonium chloride aq. solution (5 mL) and extracted with EtOAc (3×50 mL). Combined organics were washed with brine (25 mL), dried over magnesium sulfate and evaporated to dryness. The crude product was purified by silica chromatography (2% MeOH in DCM) and then further by preparative HPLC-MS (Method C) to afford the title compound as an off-white solid (21 mg, 10%).

Provenance & Evidence