Diisopropylethylamine → ((3E)-1,1-Dimethyl-4-{N-methyl-N-[(1R)1-(N-methyl-N-{(1R)-1-[N-methyl-N-(2-(pyridin-2-yl)ethyl)carbamoyl]-2-phenylethyl}carbamoyl)-2-(2-naphthyl)ethyl]carbamoyl}but-3-enyl)carbamic acid tert-butyl ester

Participants

Reaction Steps

(2E)-5-(tert-Butoxycarbonylamino)-5-methylhex-2-enoic acid (2.87 g, 11.8 mmol), 1-hydroxy-7-azabenzotriazole (1.6 g, 11.8 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (2.26 g, 11.8 mmol) were dissolved in dichloromethane (30 mL). The reaction mixture was stirred for 15 min. Ethyidiisopropylamine (2.0 mL, 11.8 mmol) was added. (2R)-N-Methyl-2-(methylamino)-N-{(1R)-1-[N-methyl-N-(2-(pyridin-2-yl)ethyl)carbamoyl]-2-phenylethyl}-3-(2-naphthyl)propionamide (6.0 g, 11.8 mmol) dissolved in dichloromethan (10 mL) was added. The reaction mixture was stirred for 16 h. The reaction mixture was washed with sat. aqueous sodium hydrogen carbonate solution (100 mL). The aqueous phase was extracted with dichloromethane (100 mL). The combined organic layers were dried over magnesium sulfate. The solvent was removed in vacuo. The crude product was purified by flash chromatography on silica (400 g), using ethyl acetate as eluent, to give 5.28 g of ((3E)-1,1-Dimethyl-4-{N-methyl-N-[(1R)1-(N-methyl-N{(1R)-1-[N-methyl-N-(2-(pyridin-2-yl)ethyl)carbamoyl]-2-phenylethyl}carbamoyl)-2-(2-naphthyl)ethyl]carbamoyl}but-3-enyl)carbamic acid tert-butyl ester.

Provenance & Evidence