Water → Tert-butyl (2S)-2-{(3-fluoro-4-methylphenyl)[(1H-imidazol-1-yl carbonothioyl)oxy]methyl}pyrrolidine-1-carboxylate

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Reaction Steps

Tert-butyl (2S)-2-[(3-fluoro-4-methylphenyl)(hydroxy)methyl]pyrrolidine-1-carboxylate (1.30 g, 4.19 mmol), which had been obtained in Example 1 (1b), 1,1′-thiocarbonyldiimidazole (1.12 g, 6.28 mmol), and 4-(dimethylamino)pyridine (0.05 g, 0.42 mmol) were dissolved in tetrahydrofuran (8.4 mL) and stirred with heating under reflux for 16 hours. The reaction solution was cooled to room temperature. Water (20 mL) was added to the reaction solution, which was then extracted with ethyl acetate (20 mL×3). After that, the organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane/ethyl acetate=2/1) to give the title compound as a yellow wax like substance (0.83 g, yield 47%).

Provenance & Evidence