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0 °C

(2E)-5-(tert-Butoxycarbonylamino)-5-methylhex-2-enoic acid (405 mg, 1.66 mmol) was dissolved in N,N-dimethylformamide (4 ml) and dichloromethane (4 ml). 1-Hydroxy-7-azabenzotriazole (227 mg, 1.66 mmol) was added. The solution was cooled to 0° C. N-(3-Dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (319 mg, 1.66 mmol) was added. The solution was stirred at 0° C. for 40 min. A solution of (2R)-N-methyl-2-methylamino-3-(2-naphthyl)-N-(3-phenylpropyl)propionamide (600 mg, 1.66 mmol) in dichloromethane (4 ml) was added. Ethyldiisopropylamine (0.29 m., 1.66 mmol) was added. The solution was stirred for 2 days, while it was slowly warming up to room temperature. The reaction mixture was diluted with ethyl acetate (100 ml) and washed with 1N hydrochloric acid (100 ml). The aqueous phase was extracted with ethyl acetate (2×50 ml). The combined organic layers were washed with saturated sodium hydrogen carbonate solution (100 ml) and dried over magnesium sulfate. The solvent was removed in vacuo. The crued product was purified by flash chromatography on silica (180 g), using ethyl acetate/hepaten (1:1) as eluent to give 706 mg of ((3E)-1,1-dimethyl-4-(N-methyl-N-((1R)-1-(N-methyl-N-(3-phenylpropyl)carbamoyl)-2-(2-naphthyl)ethyl)carbamoyl)but-3-enyl)carbamic acid tert-butyl ester.

1. stirringThe solution was stirred for 2 days, while it
2. temperaturewas slowly warming up to room temperature
3. washwashed with 1N hydrochloric acid (100 ml)
4. extractionThe aqueous phase was extracted with ethyl acetate (2×50 ml)
5. washThe combined organic layers were washed with saturated sodium hydrogen carbonate solution (100 ml)
6. dry with materialdried over magnesium sulfate
7. customThe solvent was removed in vacuo
8. customThe crued product was purified by flash chromatography on silica (180 g)