L-Phenylalanine, N-[(1,1-dimethylethoxy)carbonyl]- → (2S)-2-(((tert-butoxy)carbonyl)amino)-3-cyclohexylpropanoic acid

HRID 2412965Notes

Reaction equation

HRID 2412965 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:17]([OH:19])=[O:18])[CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H][H]>O1CCCC1.[Rh]>[C:1]([O:5][C:6]([NH:8][C@H:9]([C:17]([OH:19])=[O:18])[CH2:10][CH:11]1[CH2:16][CH2:15][CH2:14][CH2:13][CH2:12]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 2

HCID 77857L-Phenylalanine, N-[(1,1-dimethylethoxy)carbonyl]-HCID 178418361HCID 178418361, compound

Product 1

HCID 10588189(2S)-2-(((tert-butoxy)carbonyl)amino)-3-cyclohexylpropanoic acidYield 102.9%

Reagents, catalysts & solvents 2

HCID 23948RhodiumCatalystHCID 8028TetrahydrofuranSolvent

Procedure

A solution of 30.0 g (0.11 mole) of t-butoxycarbonylphenylalanine in 750 ml of tetrahydrofuran was hydrogenated at 60° for 24 hours using 50 psi hydrogen gas and 5% rhodium on carbon. The mixture was filtered and the filtrate concentrated to give the title compound (30.7 g) as a colorless oil. The oil was used without further purification. Structure assignment was supported by the nmr spectrum (loss of aromatic protons and appearance of cyclohexyl protons).

Workup

  1. filtrationThe mixture was filtered
  2. concentrationthe filtrate concentrated

Sources & evidence

ORD record
ord-901e4ddd8d68492681477a147b6b9a91
Source dataset
uspto-grants-1985_01
Patent number
US04495178

Reaction notes

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