1-Hydroxybenzotriazole → HCID 53941834, compound

Participants

Reaction Steps

To a stirred solution of (S)-2-[3-(2-tert-butoxycarbonylamino-1-methylethyl)-2-(3,5-dimethylphenyl)-1H-indol-5-yl]-2-methylpropionic acid (2.5 g in 25 mL dry methylene chloride) at 0° C. was added 1-hydroxybenzotriazole (1.0 g) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.24 g) and the reagents allowed to mix for 1 hour. At this time a solution of 7-aza-bicyclo[2.2.1]heptane hydrochloride (1.44 g) was added followed by 1.5 mL triethylamine and the reaction stirred at room temperature. After 21 hours, the mixture was concentrated in vacuo and purified by flash chromatography on silica gel (hexane:ethyl acetate, 1:1) to give the title compound (2.6 g).

Provenance & Evidence