Benzyl chloroformate → 4-[(R)-2-(tert-Butyldimethylsilyloxy)-1-(methyl)ethyl]pyrrolidine-1,3-dicarboxylic acid 1-benzyl ester 3-methyl ester

HRID 1917282Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1917282
[CH2:1]([O:8][C:9](Cl)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:12][O:13][C:14]([CH:16]1[CH:20]([C@@H:21]([CH3:31])[CH2:22][O:23][Si:24]([C:27]([CH3:30])([CH3:29])[CH3:28])([CH3:26])[CH3:25])[CH2:19][N:18](CC2C=CC=CC=2)[CH2:17]1)=[O:15].O.C(=O)(O)[O-].[Na+]>ClCCl>[CH3:12][O:13][C:14]([CH:16]1[CH:20]([C@@H:21]([CH3:31])[CH2:22][O:23][Si:24]([C:27]([CH3:30])([CH3:29])[CH3:28])([CH3:25])[CH3:26])[CH2:19][N:18]([C:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[O:10])[CH2:17]1)=[O:15]

Komponenten

5

Edukt 3

HCID 10387Benzyl chloroformateHCID 674907991-Benzyl-4-[(R)-2-(tert-butyldimethylsilyloxy)-1-(methyl)ethyl]pyrrolidine-3-carboxylic acid methyl esterHCID 86585896Sodium bicarbonate water

Produkt 1

HCID 674907934-[(R)-2-(tert-Butyldimethylsilyloxy)-1-(methyl)ethyl]pyrrolidine-1,3-dicarboxylic acid 1-benzyl ester 3-methyl esterAusbeute 89,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

Benzyloxycarbonyl chloride (10.2 mL, 71.5 mmol) was added to a solution of 1-benzyl-4-[(R)-2-(tert-butyldimethylsilyloxy)-1-(methyl)ethyl]pyrrolidine-3-carboxylic acid methyl ester (14.0 g, 35.8 mmol) in dichloromethane (200 mL), and the mixture was stirred for one hour. Saturated sodium bicarbonate water was added to the reaction mixture. The organic layer was separated, dried over magnesium sulfate, and filtered. Then, the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to give 13.9 g (89%) of the diastereomer mixture title compound as a colorless oil. The diastereomers were used for the next step without separation.

Aufarbeitung

  1. customThe organic layer was separated
  2. dry with materialdried over magnesium sulfate
  3. filtrationfiltered
  4. customThen, the solvent was evaporated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1)

Quellen und Nachweise

ORD-Eintrag
ord-16defa7d78134104a146a7919a598ff4
Quelldatensatz
uspto-grants-2013_12
Patentnummer
US08618094B2

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