4-Methylmorpholine → Z-Leu-Asp(OtBu)-Leu-Ala-CH2Cl

HRID 1417144Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1417144
[NH:1]([C:30]([O:32][CH2:33][C:34]1[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=1)=[O:31])[C@H:2]([C:7]([NH:9][C@H:10]([C:19]([NH:21][C@H:22]([C:27](O)=[O:28])[CH2:23][CH:24]([CH3:26])[CH3:25])=[O:20])[CH2:11][C:12](=[O:18])[O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:8])[CH2:3][CH:4]([CH3:6])[CH3:5].CN1CCOCC1.ClC(OCC(C)C)=O.[NH2:55][C@H:56]([C:58]([CH2:60][Cl:61])=[O:59])[CH3:57]>C1COCC1>[NH:1]([C:30]([O:32][CH2:33][C:34]1[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=1)=[O:31])[C@H:2]([C:7]([NH:9][C@H:10]([C:19]([NH:21][C@H:22]([C:27]([NH:55][C@H:56]([C:58]([CH2:60][Cl:61])=[O:59])[CH3:57])=[O:28])[CH2:23][CH:24]([CH3:26])[CH3:25])=[O:20])[CH2:11][C:12](=[O:18])[O:13][C:14]([CH3:15])([CH3:17])[CH3:16])=[O:8])[CH2:3][CH:4]([CH3:6])[CH3:5]

Komponenten

6

Edukt 4

HCID 79724-MethylmorpholineHCID 62365Isobutyl chloroformateHCID 53787392(3S)-3-amino-1-chlorobutan-2-oneHCID 131721135Z-Leu-Asp(OtBu)-Leu-OH

Produkt 1

HCID 131721136Z-Leu-Asp(OtBu)-Leu-Ala-CH2Cl

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
-20 °C

Versuchsvorschrift

Boc-Ala-CH2Cl (2 g) in 5 equiv of HCl in dioxane was stirred at room temp for 1 h. After removal of solvent, the residue was triturated with diethyl ether to give crude H-Ala-CH2Cl (1.41 g). The Z-Leu-Asp(OtBu)-Leu-OH (2.68 g) and N-methylmorpholine (0.54 mL) were dissolved in THF (25 mL), the cooled to -20° C. Isobutyl chloroformate (0.64 mL) was added to generate the mixed anhydride, which was transferred to the H-Ala-CH2Cl (1.41 g in 10 mL of DMF) solution at -20° C. The resulting mixture was allowed to come to room temp and reaction was completed in 3 h. The salt was removed by filtration. The filtrate was concentrated, redissolved in ethyl acetate (100 mL). The solution was washed with 0.2N HCl, 5% NaHCO3, sat. NaCl; dried over Na2SO4, filtered, and concentrated to yield crude solid of 3.19 g. The crude Z-Leu-Asp(OtBu)-Leu-Ala-CH2Cl was purified by Sephadex LH20 column chromatography.

Aufarbeitung

  1. customto come to room temp
  2. customreaction
  3. customThe salt was removed by filtration
  4. concentrationThe filtrate was concentrated
  5. dissolutionredissolved in ethyl acetate (100 mL)
  6. washThe solution was washed with 0.2N HCl, 5% NaHCO3, sat. NaCl
  7. dry with materialdried over Na2SO4
  8. filtrationfiltered
  9. concentrationconcentrated
  10. customto yield crude solid of 3.19 g
  11. customThe crude Z-Leu-Asp(OtBu)-Leu-Ala-CH2Cl was purified by Sephadex LH20 column chromatography

Quellen und Nachweise

ORD-Eintrag
ord-d4889fe0c9704f31acb8f7cd13b3dbe7
Quelldatensatz
uspto-grants-1999_03
Patentnummer
US05876945

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