3-Amino-4-(1H-indol-3-yl)butanoic acid--hydrogen chloride (1/1) → (S)-3-(1H-Indol-3-ylmethyl)-1-(2-phenyl-ethyl)-2-oxo-piperazine

HRID 356855Notes

Reaction equation

HRID 356855 reaction equation
C(O[C:6]([N:8]([CH2:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)[CH2:9][CH:10]=O)=[O:7])(C)(C)C.Cl.[NH:21]1[C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:23]([CH2:30][C@H:31]([NH2:36])CC(O)=O)=[CH:22]1.C([BH3-])#N.[Na+]>CO.C1COCC1.C(OCC)(=O)C>[NH:21]1[C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:23]([CH2:30][C@@H:31]2[NH:36][CH2:10][CH2:9][N:8]([CH2:12][CH2:13][C:14]3[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=3)[C:6]2=[O:7])=[CH:22]1

Participants

7

Reactant 3

HCID 27615493-Amino-4-(1H-indol-3-yl)butanoic acid--hydrogen chloride (1/1)HCID 5003444Sodium cyanoborohydrideHCID 23225807N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine

Product 1

HCID 9905691(S)-3-(1H-Indol-3-ylmethyl)-1-(2-phenyl-ethyl)-2-oxo-piperazine

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.10 g, 19.16 mmol) and (S)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((S)-tryptophan methyl ester hydrochloride salt) (4.90 g, 19.23 mmol) in methanol (50 mL) and stir for 10 minutes. Add sodium cyanoborohydride in solution (19.0 mL, 1M in THF, 19.0 mmol) and stir under an inert atmosphere for 18 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound.

Workup

  1. concentrationConcentrate in vacuo
  2. customto obtain a residue
  3. extractionextract with water
  4. customSeparate the layers
  5. dry with materialdry the organic layer over MgSO4
  6. filtrationfilter
  7. customevaporate in vacuo

Sources & evidence

ORD record
ord-aacedfdc36db4acfbcbf8e5fcad0acd4
Source dataset
uspto-grants-1998_11
Patent number
US05840726

Reaction notes

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