(R)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylenepentanoic acid → (2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acid

HRID 1477428Notes

Reaction equation

HRID 1477428 reaction equation
[C:1]1([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[CH:6]=[CH:5][C:4]([CH2:7][C@@H:8]([NH:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:9][C:10](=[CH2:14])[C:11]([OH:13])=[O:12])=[CH:3][CH:2]=1.[H][H]>[Pd].C(O)C>[C:1]1([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[CH:2]=[CH:3][C:4]([CH2:7][C@@H:8]([NH:15][C:16]([O:18][C:19]([CH3:22])([CH3:20])[CH3:21])=[O:17])[CH2:9][C@@H:10]([CH3:14])[C:11]([OH:13])=[O:12])=[CH:5][CH:6]=1

Participants

5

Reactant 2

HCID 46193439(R)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylenepentanoic acid2×HCID 178418361HCID 178418361, compound

Product 1

HCID 46193546(2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acid

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Procedure

20 mg (R)-5-Biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylenepentanoic acid (2-a, R1=Boc, R2=H, R3=CO2H) is added to ethanol (400 μl). 10% Palladium on carbon (2 mg, 50% water wet, Degussa type E101 NE/W) is then added. Hydrogen gas at ambient pressure is applied to the mixture. The mixture is stirred at ambient temperature and pressure overnight. The mixture is then filtered over Celite and washed with ethanol (2×0.5 ml). The mixture is then concentrated in vacuo to give (2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid (1-a, R1=Boc, R2=H, R3=CO2H) and (2S,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid (1-b, R1=Boc, R2=H, R3=CO2H). 1H NMR (CDCl3): 1.11-1.16, 1.21 and 1.33, 1.39-1.53, 1.70-1.92, 2.32-2.81, 3.72-3.97, 4.44-4.50, 6.41 and 6.56, 7.16-7.49, 10.84.

Workup

  1. custompressure overnight
  2. filtrationThe mixture is then filtered over Celite
  3. washwashed with ethanol (2×0.5 ml)
  4. concentrationThe mixture is then concentrated in vacuo

Sources & evidence

ORD record
ord-b4ecd521b387419a942c57f7a598f8b7
Source dataset
uspto-grants-2016_08
Patent number
US09403766B2

Reaction notes

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