Benzyl Bromide → HCID 57090391, compound

HRID 459844Notes

Reaction equation

HRID 459844 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[C:4]([CH2:9][CH3:10])[CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:17](Br)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>CN(C=O)C>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)=[C:4]([CH2:9][CH3:10])[CH:3]=1

Participants

5

Reactant 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 878774-Bromo-2-ethylphenol

Product 1

HCID 57090391HCID 57090391, compound

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
60 °C

Procedure

To a DMF solution of 4-bromo-2-ethylphenol were added potassium carbonate and benzyl bromide, and the whole was stirred at an oil bath temperature of 60° C. for 30 minutes to obtain benzyl (4-bromo-2-ethylphenyl) ether, which was then treated in a similar manner to the first half of Reference Example 2 to obtain methyl 6-(4-benzyloxy-3-ethylphenyl)pyridine-2-carboxylate. The obtained compound was stirred in a mixed solution of methanol and THF in the presence of 10% palladium/carbon under a hydrogen atmosphere of normal pressure at room temperature for 24 hours and then thus obtained product was dissolved in trifluoroacetic acid. Pentamethylbenzene was added thereto under ice cooling and the whole was stirred at an oil bath temperature of 50° C. for 1 hour and further at room temperature for 4.5 days to obtain methyl 6-(3-ethyl-4-hydroxyphenyl)pyridine-2-carboxylate. The obtained compound was treated with trifluoromethanesulfonic anhydride in pyridine to obtain methyl 6-(3-ethyl-4-trifluoromethanesulfonyloxyphenyl)pyridine-2-carboxylate. Further, to a 1,4-dioxane solution of the ester compound obtained above were added tributylvinyltin, lithium chloride, tetrakis(triphenylphosphine)palladium(0), and 2,6-di-t-butyl-4-methylphenol, and the whole was heated to reflux for 18 hours. Thereafter, tetrakis(triphenylphosphine)palladium(0) was further added thereto, followed by 2 days of heating under reflux. Then, potassium fluoride was added thereto at room temperature and the whole was stirred at room temperature for 2 days to obtain methyl 6-(3-ethyl-4-vinylphenyl)pyridine-2-carboxylate. The compound was treated with a 1M aqueous sodium hydroxide solution in methanol to obtain an objective compound.

Sources & evidence

ORD record
ord-cd39ec4105fa41299791798781c81a14
Source dataset
uspto-grants-2007_03
Patent number
US07196080B2

Reaction notes

Loading…