1-Hydroxybenzotriazole → 7-[2-(5-Chloro-2-isopropoxyphenyl)-2-oxoethylcarbamoyl]heptanoic acid methyl ester

Participants

Reaction Steps

Add diisopropylethylamine (99 ml, 568 mmol) dropwise to a solution of EDC HCl (38.01 g, 198 mmol), HOBt (19.19 g, 142 mmol) and octanedioic acid monomethyl ester (53.44 g, 1.42 mmol) in methylene chloride (800 mL) at 0° C. under nitrogen. Warm the mixture to room temperature and stir for 1 hour. Add 2-amino-1-(5-chloro-2-isopropoxyphenyl)ethanone hydrochloride (53.44 g, 142 mmol) to the mixture and stir for 18 hours. Remove the solvent under reduced pressure, dilute the residue in ethyl acetate (300 mL), wash with water (100 mL) and brine (100 mL), and dry over magnesium sulfate. Remove the solvent under reduced pressure and purify the residue by flash column chromatography on silica gel, eluting with hexanes/ethyl acetate (4:6 to 0:10), to afford 7-[2-(5-chloro-2-isopropoxyphenyl)-2-oxoethylcarbamoyl]-heptanoic acid methyl ester (23.87 g, 23% over three steps).

Provenance & Evidence