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

HRID 11447

Reaction equation

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

Participants

Conditions

Temperature: 70 °C

Procedure

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.

Workup

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

Sources & evidence

ORD record: ord-0be49fb58b2f4f039baba09b76a48389
Source dataset: uspto-grants-2006_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07098226B2

Linked notes

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