Dimethylformamide → 5-[[(1,1-Dimethylethyl)-diphenylsilyl]oxy]-3,4-dihydro-2,2,4-trimethyl-7-pentyl-2H-1-benzopyran-3-propanoic acid

HRID 399162Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 399162
[CH3:1][C:2]([Si:5]([C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)([C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1)[O:6][C:7]1[C:12]2[CH:13]([CH3:23])[CH:14]([CH2:19][CH2:20][CH2:21][OH:22])[C:15]([CH3:18])([CH3:17])[O:16][C:11]=2[CH:10]=[C:9]([CH2:24][CH2:25][CH2:26][CH2:27][CH3:28])[CH:8]=1)([CH3:4])[CH3:3].[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=[O:42].[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1.CN(C=O)C>O>[CH3:1][C:2]([Si:5]([C:35]1[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=1)([C:29]1[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=1)[O:6][C:7]1[C:12]2[CH:13]([CH3:23])[CH:14]([CH2:19][CH2:20][C:21]([OH:42])=[O:22])[C:15]([CH3:17])([CH3:18])[O:16][C:11]=2[CH:10]=[C:9]([CH2:24][CH2:25][CH2:26][CH2:27][CH3:28])[CH:8]=1)([CH3:4])[CH3:3]

Komponenten

5

Edukt 3

HCID 6228DimethylformamideHCID 2724130Cornforth reagentHCID 189701315-[[(1,1-Dimethylethyl)diphenylsilyl]oxy]-3,4-dihydro-2,2,4-trimethyl-7-pentyl-2H-1-benzopyran-3-propanol

Produkt 1

HCID 189701375-[[(1,1-Dimethylethyl)-diphenylsilyl]oxy]-3,4-dihydro-2,2,4-trimethyl-7-pentyl-2H-1-benzopyran-3-propanoic acidAusbeute 48,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

A mixture of 2.2 g (3.97 mmol) of 5-[[(1,1-Dimethylethyl)diphenylsilyl]oxy]-3,4-dihydro-2,2,4-trimethyl-7-pentyl-2H-1-benzopyran-3-propanol and 7.47 g (19.86 mmol) of pyridinium dichromate (Aldrich) in anhy. DMF (Aldrich) was stirred at RT under argon for 20 hr. The reaction was diluted with water and extracted with EtOAc. The organic phase was dried and solvent removed under reduced pressure. The residue was then purified by repeated chromatography on silica gel to give 1.1 g (48%) of 5-[[(1,1-Dimethylethyl)diphenylsilyl]oxy]-3,4-dihydro-2,2,4-trimethyl-7-pentyl-2H-1-benzopyran-3-propanoic acid as a pale yellow foam. HR EI MS: Calc M+, 572.3322; Observed, 572.3315. Ratio of 8:1 diastereoisomers as shown by 1H-NMR.

Aufarbeitung

  1. extractionextracted with EtOAc
  2. customThe organic phase was dried
  3. customsolvent removed under reduced pressure
  4. customThe residue was then purified

Quellen und Nachweise

ORD-Eintrag
ord-25011d0e8ae84d01aa6c6f6be9830a04
Quelldatensatz
uspto-grants-1998_10
Patentnummer
US05817766

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