1,2-Dichloroethane → 4-[(S)-4-tert-Butoxycarbonyl-2-({4-[2-((S)-2-cyclobutylcarbamoyl-pyrrolidin-1-yl)-2-oxo-ethoxy]-7-methyl-naphthalene-2-carbonyl}-amino)-butyryl]-piperazine-1-carboxylic acid butyl ester

Participants

Reaction Steps

To a solution of 670 mg of 4-{(S)-4-tert-Butoxycarbonyl-2-[(4-carboxymethoxy-7-methyl-naphthalene-2-carbonyl)-amino]-butyryl}-piperazine-1-carboxylic acid butyl ester in 10 ml of DCM, 418 mg of EDC, 402 mg of pentafluorophenol was added and the reaction mixture was stirred for 2 h. Then, 329 mg of (S)-Pyrrolidine-2-carboxylic acid cyclobutylamide hydrochloride and 251 mg of NEM in 1.5 ml of DCM was added. After 16 h the reaction mixture was diluted with water. After filtration through a chem Elut® cartridge by eluting with ethyl acetate the solvents were removed under reduced pressure. The crude product obtained after evaporation of the solvent was purified by flash chromatography on silica using an ethyl acetate/heptane gradient. Yield: 1.5 g

Provenance & Evidence