Piperidine → 4-Acetyl-L-phenylalanine

HRID 1988529Notes

Reaction equation

HRID 1988529 reaction equation
C([NH:18][C@H:19]([C:30]([OH:32])=[O:31])[CH2:20][C:21]1[CH:26]=[CH:25][C:24]([C:27](=[O:29])[CH3:28])=[CH:23][CH:22]=1)(OCC1C2C(=CC=CC=2)C2C1=CC=CC=2)=O.N1CCCCC1>O>[C:27]([C:24]1[CH:25]=[CH:26][C:21]([CH2:20][C@@H:19]([C:30]([OH:32])=[O:31])[NH2:18])=[CH:22][CH:23]=1)(=[O:29])[CH3:28]

Participants

4

Reactant 2

HCID 8082PiperidineHCID 20821099HCID 20821099, compound

Product 1

HCID 64201234-Acetyl-L-phenylalanineYield 88%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

Fmoc-4-acetyl-L-phenylalanine was purchased from RSP Amino Acid Analogues, Inc. (Worcester, Mass.). This compound (1.0 g, 2.3 mmol) was stirred with 4 mL of piperidine (20% in DMF) for 2 hours at room temperature. The solvent was evaporated to obtain white powder. The solid was then resuspended in 10 mL of cold water (0.1% TFA), and the supernatant was collected by filtration. Preparative reverse-phase HPLC (Microsorb C18, Rainin Instrument Co., Inc., Woburn, Mass.) was used to separate the desired product from the reaction mixture (5-30% CH3CN in H2O with 0.1% TFA over 30 min). The eluant (tR=12 min) was lyophilized to obtain a white solid (0.45 g, 88%). 1H NMR (400 MHz D2O): δ 7.85-7.28 (m, 4H), 4.23 (dd, 1H, 5.4 Hz), 3.2 (m, 2H), 2.7 (s, 3H). MS (ESI): [M+1]+ calculated for C11H13NO3 208.09, found 208.47.

Workup

  1. customThe solvent was evaporated
  2. customto obtain white powder
  3. filtrationthe supernatant was collected by filtration
  4. customto separate the desired product from the reaction mixture (5-30% CH3CN in H2O with 0.1% TFA over 30 min)

Sources & evidence

ORD record
ord-fc92df8ddb7e4cfaa60b9fdffa08cf81
Source dataset
uspto-grants-2010_01
Patent number
US07642085B2

Reaction notes

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