Water → ethyl (R)-2-tert-butoxycarbonylamino-5-(4-chlorophenyl)-5-oxopentanoate

HRID 553926

Reaktionsgleichung

Reaktionsgleichung von HRID 553926
[CH3:1][CH2:2][O:3][C:4]([C@H:6]1[CH2:10][CH2:9][C:8](=[O:11])[N:7]1[C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])=[O:5].[Cl:19][C:20]1[CH:25]=[CH:24][C:23]([Mg]Br)=[CH:22][CH:21]=1.O>O1CCCC1>[C:15]([O:14][C:12]([NH:7][C@H:6]([CH2:10][CH2:9][C:8]([C:23]1[CH:24]=[CH:25][C:20]([Cl:19])=[CH:21][CH:22]=1)=[O:11])[C:4]([O:3][CH2:2][CH3:1])=[O:5])=[O:13])([CH3:18])([CH3:17])[CH3:16]

Komponenten

5

Edukt 3

HCID 962WaterHCID 8208851-Boc-D-Pyroglutamic acid ethyl esterHCID 178478191HCID 178478191, Verbindung

Produkt 1

HCID 67371186ethyl (R)-2-tert-butoxycarbonylamino-5-(4-chlorophenyl)-5-oxopentanoate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a solution of (R)-5-oxopyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester (CAS No. 128811-48-3; 4.0 g) in tetrahydrofuran (100 mL), 4-chlorophenylmagnesium bromide (1.0 M solution in diethyl ether; 17.1 mL) was added dropwise at −40° C. over 20 minutes, and the reaction solution was stirred at −40° C. to 0° C. for one hour. Water was added to the solution in small portions at 0° C., followed by extraction with ethyl acetate. The extract was washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (heptane-ethyl acetate system) to obtain 5.6 g of the title compound as a colorless oil. The property values of the compound are as follows.

Aufarbeitung

  1. extractionfollowed by extraction with ethyl acetate
  2. washThe extract was washed with brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (heptane-ethyl acetate system)

Quellen und Nachweise

ORD-Eintrag
ord-3a471e17106143ac9a3ff2b3fe3745ff
Quelldatensatz
uspto-grants-2011_11
Patentnummer
US08048878B2

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