Sodium hydride → (4-Iodo-pyridin-3-yl)-(2,2,2-trifluoro-ethyl)-carbamic acid tert-butyl ester

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Reaction Steps

To a solution of (4-iodo-pyridin-3-yl)-carbamic acid tert-butyl ester (280 mg, 875 μmol) in DMF (4 mL) was added NaH (42.0 mg, 962 μmol, 60% dispersion in mineral oil) at 0° C. The reaction mixture was stirred at room temperature for 30 minutes. 2,2,2-Trifluoroethyl trifluoromethanesulphonate (203 mg, 126 μL, 875 μmol, CAS RN 6226-25-1) was added and the reaction stirred at room temperature for 2 hours. The reaction mixture was poured on 30 mL 10% aqueous NaHCO3 solution and 30 mL EtOAc and the layers were separated. The aqueous layer was extracted a second time with 30 mL EtOAc and the combined organic layers were washed with 30 mL brine, dried over MgSO4, filtered and concentrated under vacuum. The compound was purified by silica gel chromatography using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of n-heptane:EtOAc (100:0 to 30:70). Colorless solid (207 mg, 59%). MS (ESI): m/z=403.012 [M+H]+.

Provenance & Evidence