Hydrochloric Acid → HCID 67520568, compound

Participants

Reaction Steps

To a solution of tert-butyl (2S)-5-[bis(2-{[(benzyloxy)carbonyl]amino}ethyl)amino]-2-{bis[(tert-butoxy)carbonyl]amino}pentanoate XXXI (3.00 g, 4.04 mmol) in ethyl acetate (20 mL) was added HCl (3.5 M solution in EtOAc, 20 mL). The reaction mixture was stirred for 30 min at r.t. before adding ethyl ether (about 50 mL). The precipitate was filtered and washed with ether to give (2S)-5-[bis(2-{[(benzyloxy)carbonyl]amino}ethyl)amino]-2-{bis[(tert-butoxy)carbonyl]amino}pentanoic acid as a white crystalline solid (1.82 g, 3.14 mmol, 78% yield).

Provenance & Evidence