Ethanol → HCID 67048530, compound

Participants

Reaction Steps

5.00 g (11.3 mmol) dicyclohexylammonium-(2S)-2-(benzyloxycarbonyl-amino)-4-cyano-butanoate are stirred into in 100 ml of 5% citric acid solution and then extracted with ethyl acetate. The combined organic phases are dried over sodium sulphate and the solvent is distilled off i. vac. The residue is dissolved in 70 ml THF, 4.35 g (13.5 mmol) TBTU and 6.35 ml (33.8 mmol) DIPEA are added and the mixture is stirred for 10 minutes at ambient temperature. Then 50 ml of ethanol are added and the mixture is refluxed for 16 hours. Then the reaction mixture is evaporated down i. vac., taken up in ethyl acetate, washed with semisaturated sodium hydrogen carbonate solution and water, dried over sodium sulphate and evaporated down i. vac.

Provenance & Evidence