tert-butyl(1S)-5-{[(benzyloxy)carbonyl]amino}-1-(1-hydroxy-2-oxo-2-{[(1R)-1-phenylethyl]amino}ethyl)pentylcarbamate → tert-butyl (1S)-5-amino-1-(1-hydroxy-2-oxo-2-{[(1R)-1-phenylethyl]amino}ethyl)pentylcarbamate

Participants

Reaction Conditions

Reaction Steps

A slurry of palladium on carbon (1.5 g, 10% w/w) in water (3 mL) was added to a solution of tert-butyl (1S)-5-{[(benzyloxy)carbonyl]amino}-1-(1-hydroxy-2-oxo-2-{[(1R)-1-phenylethyl]amino}ethyl)pentylcarbamate (15.28 g, 29.70 mmol) in ethanol (200 mL). The resulting slurry was stirred vigorously under a hydrogen atmosphere (45 psi) at 50° C. for 18 h. Catalyst was then filtered off, rinsing with ethanol (400 mL). Concentration of the filtrate under vacuum afforded tert-butyl (1S)-5-amino-1-(1-hydroxy-2-oxo-2-{[(1R)-1-phenylethyl]amino}ethyl)pentylcarbamate as a colorless oil that crystallized upon standing under vacuum (10.52 g, 93%). 1H NMR (300 MHz, DMSO-d6) δ 8.15 (d, J=8 Hz) and 8.08 (d, J=8 Hz) total 1H, 7.90-7.87 (m, ca 1H); 7.87-7.28 (m, 4H); 7.25-7.20 (m, 1H); 6.51 (d, J=9 Hz) and 6.17 (d, J=9 Hz) total 1H; 4.99-4.92 (m, 1H); 3.96 (d, J=4 Hz) and 3.90 (d, J=3 Hz) total 1H, 3.80-3.69 (m, 1H); 2.68-2.64 (m) and 2.53-2.57 (m) total 1H, 1.53-1.23 (m, 18H). ES-LCMS m/z 380 (M+H).

Provenance & Evidence