tert-Butanol → 6-(4-Bromo-2-methyl-phenylamino)-3-(4,5-dihydroxy-pentyl)-7-fluoro-3H-benzoimidazole-5-carboxylic acid cyclopropylmethoxy-amide

Participants

Reaction Steps

6-(4-Bromo-2-methyl-phenylamino)-7-fluoro-3-pent-4-enyl-3H-benzoimidazole-5-carboxylic acid cyclopropylmethoxy-amide 11f (0.307 g, 0.612 mmol) is dissolved in 4:1 THF/water (8 mL) and 1.134 mL (0.061 mmol) of an 0.054 M OsO4 solution in t-BuOH iias added followed by NMO (0.093 g, 0.796 mmol). After 5 hours, the reaction mixture is quenched by the addition of 10% NaHS2O3 solution. After 10 minutes, the reaction mixture is filtered through Celite rinsing with ethyl acetate and methylene chloride. The filtrate is diluted with ethyl acetate and washed with 0.01 N HCl, and brine. The organic layer is dried (Na2SO4) and concentrated under reduced pressure. The crude product is purified by FCC eluted with 9:1 ethyl acetate/MeOH to give 0.244 g (74%) pure desired product.

Provenance & Evidence