Diisopropylcarbodiimide → (S)-methyl 2-(2-(3,5-dimethylphenyl)acetamido)-3-(1H-indol-3-yl)propanoate

HRID 71025

Reaktionsgleichung

Reaktionsgleichung von HRID 71025
CC(N=C=NC(C)C)C.[CH3:10][O:11][C:12](=[O:25])[C@H:13]([CH2:15][C:16]1[C:24]2[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=2)[NH:18][CH:17]=1)[NH2:14].[CH3:26][C:27]1[CH:28]=[C:29]([CH2:34][C:35](O)=[O:36])[CH:30]=[C:31]([CH3:33])[CH:32]=1>CN(C1C=CN=CC=1)C.C(Cl)Cl>[CH3:26][C:27]1[CH:28]=[C:29]([CH2:34][C:35]([NH:14][C@@H:13]([CH2:15][C:16]2[C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[NH:18][CH:17]=2)[C:12]([O:11][CH3:10])=[O:25])=[O:36])[CH:30]=[C:31]([CH3:33])[CH:32]=1

Komponenten

6

Edukt 3

HCID 12734DiisopropylcarbodiimideHCID 77980L-Tryptophan, methyl esterHCID 47494952-(3,5-Dimethylphenyl)acetic acid

Produkt 1

HCID 67042226(S)-methyl 2-(2-(3,5-dimethylphenyl)acetamido)-3-(1H-indol-3-yl)propanoate

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 142844-(Dimethylamino)pyridineKatalysatorHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

DMAP (122.2 mg, 0.5 mmol) and DIC (N,N-diisopropylcarbodiimide) (235 μl, 1.5 mmol) were added to a solution of tryptophan methyl ester (255 mg, 1.0 mmol) and 3,5-dimethylphenylacetic acid (164 mg, 1.0 mmol) in dry DCM (11 ml). After 17 h at room temperature the solvent was removed under reduced pressure and the crude product was purified by flash chromatography (DCM containing 1% EtOH) to afford (S)-methyl 2-(2-(3,5-dimethylphenyl)acetamido)-3-(1H-indol-3-yl)propanoate. An aqueous solution of LiOH (1N, 4.5 ml, 4.5 mmol) was added to a solution of (S)-methyl 2-(2-(3,5-dimethylphenyl)acetamido)-3-(1H-indol-3-yl)propanoate (365 mg, 1 mmol) in methanol (24.5 ml) and the reaction mixture was stirred at room temperature for 4.5 h. Then water was added and methanol was removed under reduced pressure. The aqueous residue was washed with DCM (5×20 ml), treated with HCl 2N to obtain a pH 4 and extracted with DCM (3×25 ml). The organic phases were dried with anhydrous Na2SO4 and the solvent was removed under reduced pressure to afford (S)-2-(2-(3,5-dimethylphenyl)acetamido)-3-(1H-indol-3-yl)propionic acid (93% c.y.).

Aufarbeitung

  1. customAfter 17 h at room temperature the solvent was removed under reduced pressure
  2. customthe crude product was purified by flash chromatography (DCM containing 1% EtOH)

Quellen und Nachweise

ORD-Eintrag
ord-910acda96cbd40a7b0df098feb9d2f80
Quelldatensatz
uspto-grants-2014_09
Patentnummer
US08822698B2

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