Triethylamine → N-(Benzyloxycarbonyl)-4,6-dibromotryptophan ethyl ester

HRID 1078430Notes

Reaction equation

HRID 1078430 reaction equation
[CH2:1]([O:3][C:4](=[O:19])[C@H:5]([CH2:7][C:8]1[C:16]2[C:11](=[CH:12][C:13]([Br:18])=[CH:14][C:15]=2[Br:17])[NH:10][CH:9]=1)[NH2:6])[CH3:2].C(N(CC)CC)C.Cl[C:28]([O:30][CH2:31][C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)=[O:29]>C(Cl)Cl>[CH2:1]([O:3][C:4](=[O:19])[C@H:5]([CH2:7][C:8]1[C:16]2[C:11](=[CH:12][C:13]([Br:18])=[CH:14][C:15]=2[Br:17])[NH:10][CH:9]=1)[NH:6][C:28]([O:30][CH2:31][C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)=[O:29])[CH3:2]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10387Benzyl chloroformateHCID 186560674,6-Dibromotryptophan ethyl ester

Product 1

HCID 53945469N-(Benzyloxycarbonyl)-4,6-dibromotryptophan ethyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

Mix DL-4,6-dibromotryptophan ethyl ester (1.20 g, 3.07 mmol), triethylamine (341 mg, 3.38 mmol) and methylene chloride (50 mL). Add benzyl chloroformate (692 mg, 4.06 mmol) and stir for 12 hours. Dilute with methylene chloride, wash with 1M hydrochloric acid (100 mL) and brine (100 mL). Dry (MgSO4) and evaporate the solvent in vacuo and purify by silica gel chromatography to give the title compound.

Workup

  1. washwash with 1M hydrochloric acid (100 mL) and brine (100 mL)
  2. dry with materialDry (MgSO4)
  3. customevaporate the solvent in vacuo
  4. custompurify by silica gel chromatography

Sources & evidence

ORD record
ord-d3f97451fbd14c58911855095376d7fc
Source dataset
uspto-grants-1996_08
Patent number
US05547991

Reaction notes

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