Diisopropylethylamine → tert-butyl (2S)-2-benzyloxycarbonylamino-3-(4-(2-methoxycarbonylethyl)benzoylamino)propionate

HRID 2297385Notes

Reaction equation

HRID 2297385 reaction equation
[CH3:1][O:2][C:3]([CH2:5][CH2:6][C:7]1[CH:15]=[CH:14][C:10]([C:11]([OH:13])=O)=[CH:9][CH:8]=1)=[O:4].[NH2:16][CH2:17][C@H:18]([NH:26][C:27]([O:29][CH2:30][C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)=[O:28])[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20].F[B-](F)(F)F.C(C(=NOC(N(C)C)=[N+](C)C)C(OCC)=O)#N.C(N(C(C)C)CC)(C)C>CN(C)C=O>[CH2:30]([O:29][C:27]([NH:26][C@@H:18]([CH2:17][NH:16][C:11](=[O:13])[C:10]1[CH:9]=[CH:8][C:7]([CH2:6][CH2:5][C:3]([O:2][CH3:1])=[O:4])=[CH:15][CH:14]=1)[C:19]([O:21][C:22]([CH3:23])([CH3:24])[CH3:25])=[O:20])=[O:28])[C:31]1[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=1

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 2733286O-[(Ethoxycarbonyl)cyanomethylenamino]-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 10803731(S)-tert-Butyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoateHCID 113102944-(3-Methoxy-3-oxopropyl)benzoic acid

Product 1

HCID 15512203tert-butyl (2S)-2-benzyloxycarbonylamino-3-(4-(2-methoxycarbonylethyl)benzoylamino)propionate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

354 mg (1.7 mmol) of 4-(2-methoxycarbonylethyl)benzoic acid and 500 mg (1.7 mmol) of tert-butyl (2S)-3-amino-2-benzyloxycarbonylaminopropionate were dissolved in 3 ml of dimethylformamide and treated with 557 mg (1.7 mmol) of O-((cyano-(ethoxycarbonyl)-methylidene)amino)-1,1,3,3-tetramethyluronium tetrafluoroborate (TOTU) and 204 mg (1.7 mmol) of diisopropylethylamine and the mixture was stirred at room temperature for 7 h at pH 7-8. The solvent was removed in vacuo, the residue was dissolved in ethyl acetate and the solution was washed three times each with KHSO4 solution and NaHCO3 solution until neutral. The organic phase was separated off and dried and the solvent was removed by distillation in vacuo. Yield: 770 mg (93%).

Workup

  1. customThe solvent was removed in vacuo
  2. dissolutionthe residue was dissolved in ethyl acetate
  3. washthe solution was washed three times each with KHSO4 solution and NaHCO3 solution until neutral
  4. customThe organic phase was separated off
  5. customdried
  6. customthe solvent was removed by distillation in vacuo

Sources & evidence

ORD record
ord-ae0174f7101e40bfacf278062e9dfe9e
Source dataset
uspto-grants-2002_12
Patent number
US06492356B1

Reaction notes

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