tert-butyl (3R,5E)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-6-[3-methyl-(4-phenyl)phenyl]hex-5-enoate → tert-butyl (3R)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-6-[3-methyl-(4-phenyl)phenyl]hexanoate

Participants

Reaction Steps

A solution of tert-butyl (3R,5E)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-6-[3-methyl-(4-phenyl)phenyl]hex-5-enoate (1.91 gm, 3.2 mmol) in ethanol (80 mL) was hydrogenated over 10% palladium on charcoal (120 mg) at 3 bar and 20° C. for 16 h. The mixture was filtered through Arbocel filter aid and concentrated under reduced pressure to give tert-butyl (3R)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-6-[3-methyl-(4-phenyl)phenyl]hexanoate (2.07 gm, 108%), as a colourless foam, which was taken onto the next step without purification (see Example 1).

Provenance & Evidence