tert-Butanol → tert-butyl 4-((5-(2-(4-chloro-3-methoxyphenyl)propan-2-yl)-1-(4-fluorophenyl)-1H-imidazol-2-ylthio)methyl)-3,5-difluorophenylcarbamate

Participants

Reaction Steps

To a solution of 4-((5-(2-(4-chloro-3-methoxyphenyl)propan-2-yl)-1-(4-fluorophenyl)-1H-imidazol-2-ylthio)methyl)-3,5-difluorobenzoic acid (88 g, 0.16 mmol) in toluene (590 mL) and tert-butanol (200 mL) were added DPPA (49 g, 0.178 mol) and DIPEA (272 g, 0.21 mol) at 0° C. The reaction mixture was warmed to room temperature, stirred 30 min and heated at 80° C. overnight. After cooling, the reaction mixture was diluted with EtOAc (800 mL) and washed with 10% citric acid (1.5 L), satd NaHCO3 (1.5 L) and brine (1.5 L), dried over MgSO4, filtered and concentrated under reduced pressure to give a residue. The resulting residue was purified by column chromatography (Hex/EtOAc=3:1 to 2:1, v/v) to afford tert-butyl 4-((5-(2-(4-chloro-3-methoxyphenyl)propan-2-yl)-1-(4-fluorophenyl)-1H-imidazol-2-ylthio)methyl)-3,5-difluorophenylcarbamate (75 g, 74%) as a light-pink foam. 1H NMR (400 MHz, CDCl3): δ 7.22 (s, 1H), 7.14-7.16 (d, 1H), 6.88-6.92 (d, 2H), 6.85 (s, 1H), 6.75-6.80 (t, 2H), 6.48-6.53 (m, 2H), 6.33-6.37 (m, 2H), 3.99 (s, 2H), 3.76 (s, 3H), 1.52 (s, 9H), 1.49 (s, 6H).

Provenance & Evidence