Potassium Carbonate → {(1S,2S)-1-[5-(2-fluoro-phenyl)-1H-imidazol-2-yl]-2-phenyl-propyl}-carbamic acid tert-butyl ester

関与物質

反応手順

To a degassed mixture of {(1S,2S)-1-[5-(2-fluoro-4-iodo-phenyl)-1H-imidazol-2-yl]-2-phenyl-propyl}-carbamic acid tert-butyl ester (150 mg, 0.288 mmol) in toluene (5 mL) and 1:1 v/v deionized water/ethanol (2 mL) were added dichlorobis(tricyclohexylphosphine)palladium(II) (6.4 mg, 0.009 mmol), cyclopropylboronic acid (27 mg, 0.314 mmol), potassium carbonate (159 mg, 1.15 mmol) and the mixture refluxed for 3 hours under an atmosphere of nitrogen. The mixture was diluted with ethyl acetate (50 mL) and washed with water (50 mL). The aqueous layer was washed with ethyl acetate (50 mL) and the combined organic extracts were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by chromatography over silica gel gradient eluted between 0 and 40% v/v ethyl acetate in hexanes to give {(1S,2S)-1-[5-(2-fluoro-phenyl)-1H-imidazol-2-yl]-2-phenyl-propyl}-carbamic acid tert-butyl ester (122 mg, 107%) which was then used in step 17-G. HR-MS: calcd for C29H27FN4O4 [M+H+] 515.2089. Found 515.2089.

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