Hydrogen chloride-ethyl acetate → HCID 86761425, compound

Participants

Reaction Steps

Methyl (1R,2S)-2-({N5-[(benzyloxy)carbonyl]-N2-(tert-butoxycarbonyl)-L-ornithyl}amino)cyclopentanecarboxylate (11.33 g) was suspended in ethyl acetate (34 ml), and a 4 M hydrogen chloride/ethyl acetate solution (52 ml) was added thereto, followed by stirring at room temperature for 2 hours. The reaction mixture was concentrated under reduced pressure, and to the residue were added ethyl acetate (150 ml) and a saturated sodium bicarbonate solution (150 ml), followed by stirring for 5 minutes and performing a liquid separation operation. The aqueous layer was extracted with ethyl acetate (100 ml), and then the organic layer was combined, washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure to obtain methyl (1R,2S)-2-({N5-[(benzyloxy)carbonyl]-L-ornithyl}amino)cyclopentanecarboxylate (9.0 g).

Provenance & Evidence