Dimethylformamide → (R)-Methyl 2-(4-((5-(2-(4-chloro-3-methoxyphenyl)propan-2-yl)-1-(4-fluorophenyl)-1H-imidazol-2-ylthio)methyl)-3,5-difluorophenylsulfonamido)propanoate

関与物質

反応条件

反応手順

To a solution of 4-((5-(2-(4-chloro-3-methoxyphenyl)propan-2-yl)-1-(4-fluorophenyl)-1H-imidazol-2-ylthio)methyl)-3,5-difluorbenzenesulfonic acid (3.0 g, 5.1 mmol) in DCM (15 mL) was added thionyl chloride (7.5 mL) and DMF (0.1 mL). The mixture was heated at 65° C. for 1 h then concentrated in vacuo and azeotroped with toluene (10 mL) and DCM (10 mL). The pale yellow foam was dissolved in DCM (15 mL) and was added dropwise to a solution of D-alanine methyl ester (2.9 g, 20.6 mmol) in 2M Na2CO3 (30 mL) with vigorous stirring. Upon complete addition the layers were separated and the organics were dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography eluting with 0-70% ethyl acetate/hexane to afford a white foam (2.4 g, 77%). MS (EI) m/z 601.3 (M+).

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