Potassium Carbonate → 4-Bromo-3,5-dimethylphenyl 3-(4-nitrophenyl)propiolate

HRID 1483190Notes

Reaction equation

I[C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][CH:3]=1.C([O-])([O-])=O.[K+].[K+].[C:17]([O:21][C:22]1[CH:27]=[C:26]([CH3:28])[C:25]([Br:29])=[C:24]([CH3:30])[CH:23]=1)(=[O:20])[C:18]#[CH:19]>C1COCC1.[Cu]I>[N+:8]([C:5]1[CH:6]=[CH:7][C:2]([C:19]#[C:18][C:17]([O:21][C:22]2[CH:23]=[C:24]([CH3:30])[C:25]([Br:29])=[C:26]([CH3:28])[CH:27]=2)=[O:20])=[CH:3][CH:4]=1)([O-:10])=[O:9]

Participants

Conditions

Temperature: 65 °C

Procedure

1-Iodo-4-nitrobenzene (550 mg, 2.17 mmol) in THF (4 mL) was degassed under reduced pressure at −78° C., and then nitrogen gas was introduced. To the solution was added K2CO3 (552 mg, 298.6 mmol), CuI (30 mg, 0.16 mmol) and PdCl2(Ph3P)2 (14 mg, 0.020 mmol), and the mixture was stirred at 65° C. 4-bromo-3,5-dimethylphenyl propiolate (6-1) (506 mg, 2.03 mmol) in THF (2.5 mL) was added by syringe pump over a period of 6 h. After being cooled to room temperature, the mixture was filtered and washed with EtOAc. The filtrate was concentrated and purified by silica gel column chromatography to give the title compound 7-1 (551 mg, 74% yield) as a brown solid.

Workup

additionnitrogen gas was introduced
temperatureAfter being cooled to room temperature
filtrationthe mixture was filtered
washwashed with EtOAc
concentrationThe filtrate was concentrated
custompurified by silica gel column chromatography

Sources & evidence

ORD record: ord-cb9e5fa46bd34dd29ce6afa7a9084312
Source dataset: uspto-grants-2016_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09416121B2

Reaction notes

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