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2-(tert-Butyldimethylsilyl)-N,N-dimethyl-1H-imidazole-1-sulfonamide → Rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1h-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester

HRID 1694794
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1694794
[CH3:1][N:2]([CH3:18])[S:3]([N:6]1[CH:10]=[CH:9][N:8]=[C:7]1[Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12])(=[O:5])=[O:4].[CH2:19]([O:21][C:22]([C:24]1[O:25][C:26]2[C:32]([CH:33]=[O:34])=[CH:31][C:30]([CH3:35])=[CH:29][C:27]=2[CH:28]=1)=[O:23])[CH3:20]>C1COCC1.CCCCCCC>[CH2:19]([O:21][C:22]([C:24]1[O:25][C:26]2[C:32]([CH:33]([C:9]3[N:8]=[C:7]([Si:11]([C:14]([CH3:15])([CH3:17])[CH3:16])([CH3:13])[CH3:12])[N:6]([S:3](=[O:4])(=[O:5])[N:2]([CH3:18])[CH3:1])[CH:10]=3)[OH:34])=[CH:31][C:30]([CH3:35])=[CH:29][C:27]=2[CH:28]=1)=[O:23])[CH3:20]
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Komponenten

5

Edukt 2

HCID 64202092-(tert-Butyldimethylsilyl)-N,N-dimethyl-1H-imidazole-1-sulfonamideHCID 589519217-Formyl-5-methyl-benzofuran-2-carboxylic acid ethyl ester

Produkt 1

HCID 58951952Rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1h-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 8028TetrahydrofuranLösungsmittel2×
HCID 8900HeptaneLösungsmittel

Versuchsvorschrift

A solution of 2-(tert-butyl-dimethyl-silanyl)-imidazole-1-sulfonic acid dimethylamide (1.0 g) in THF (10 ml) was cooled under an Argon atmosphere to −78° C. n-Buthyllithium solution (1.6 M in heptane, 2.37 ml) were added dropwise. After stirring for 1 hr at −78° C. a solution of 7-formyl-5-methyl-benzofuran-2-carboxylic acid ethyl ester (963 mg) in THF (10 ml) was added dropwise. Stirring was continued for 15 min at −78° C., then the reaction mixture was warmed up to r.t. overnight. After quenching with water, the mixture was extracted with EtOAc. The organics were dried over MgSO4, filtrated and concentrated. The crude product was purified by column chromatography (silica gel; gradient: cyclohexane→cyclohexane/EtOAc 1:1) to give rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1H-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester as light yellow amorphous solid; MS (ISP): 522.3 ((M+H)+.).

Aufarbeitung

  1. additionwere added dropwise
  2. additionwas added dropwise
  3. customAfter quenching with water
  4. extractionthe mixture was extracted with EtOAc
  5. dry with materialThe organics were dried over MgSO4
  6. filtrationfiltrated
  7. concentrationconcentrated
  8. customThe crude product was purified by column chromatography (silica gel; gradient: cyclohexane→cyclohexane/EtOAc 1:1)

Quellen und Nachweise

ORD-Eintrag
ord-928f8e0546c844bd81bca93d307fdc4f
Quelldatensatz
uspto-grants-2012_04
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08158668B2

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