Dimethylformamide → Benzyl 3-(4-pyridyl)-2-butenoate

HRID 1725845

Reaktionsgleichung

CN(C)C=O.[C:6]([C:9]1[CH:14]=[CH:13][N:12]=[CH:11][CH:10]=1)(=O)[CH3:7].[Br-].[CH2:16]([O:23][C:24]([CH2:26][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)=[O:25])[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.C(=O)([O-])[O-].[K+].[K+]>C(OCC)C>[N:12]1[CH:13]=[CH:14][C:9]([C:6]([CH3:7])=[CH:26][C:24]([O:23][CH2:16][C:17]2[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=2)=[O:25])=[CH:10][CH:11]=1

Komponenten

Reaktionsbedingungen

Temperatur: 70 °C

Versuchsvorschrift

N,N-Dimethylformamide (33 ml) was added to a mixture of 4-acetylpyridine (2.00 g, 16.5 mmol) and (benzyloxycarbonyl)methyltriphenylphosphonium bromide (8.94 g, 18.2 mmol), and the whole was stirred under ice-cooling. Potassium carbonate (9.12 g, 66.0 mmol) was added thereto, the external temperature was raised to 70° C., and the whole was stirred overnight. The reaction mixture was diluted with diethyl ether (100 ml), and the whole was washed with water (100 ml, twice) and saturated brine (50 ml) successively. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give 1.77 g (42%: mixture of E form and Z form) of benzyl 3-(4-pyridyl)-2-butenoate as a pale yellow oily matter.

Aufarbeitung

temperaturecooling
stirringthe whole was stirred overnight
washthe whole was washed with water (100 ml
dry with materialThe organic layer was dried over magnesium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by silica gel column chromatography

Quellen und Nachweise

ORD-Eintrag: ord-35a7d8b67173438c8405755add3d6938
Quelldatensatz: uspto-grants-2009_02
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07491739B2

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