4-(3-Methyl-5-vinylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester → 4-(5-Ethyl-3-methylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester

HRID 1804047Notes

Reaction equation

HRID 1804047 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:19]([CH3:20])=[CH:18][C:17]([CH:21]=[CH2:22])=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]>C(O)C>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:19]([CH3:20])=[CH:18][C:17]([CH2:21][CH3:22])=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

3

Reactant 1

HCID 673806954-(3-Methyl-5-vinylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 673812894-(5-Ethyl-3-methylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl esterYield 99.3%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a mixture of 4-(5-bromo-3-methylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (11 g), bis(tricyclohexylphosphine)palladium (II) dichloride (1 g), tripotassium phosphate (13 g) and vinylboronic acid pinacol ester (10 g) were added toluene (90 mL) and water (4.5 mL), and the mixture was refluxed for 8 hr. After cooling, the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and the solvent was evaporated. The residue was purified by column chromatography (hexane:ethyl acetate) to give 4-(3-methyl-5-vinylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (9 g). 4-(3-Methyl-5-vinylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (9 g) was dissolved in ethanol (90 mL), 5% palladium carbon-ethylenediamine complex (2 g) was added, and the mixture was stirred under a hydrogen atmosphere at room temperature overnight. After celite filtration, the solvent in the filtrate was evaporated to give 4-(5-ethyl-3-methylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (9 g). 4-(5-Ethyl-3-methylpyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (9 g) was dissolved in chloroform (20 mL), 4N hydrogen chloride/ethyl acetate (20 mL) was added, and the mixture was stirred at room temperature overnight. Ethyl acetate (100 mL) was added, and the precipitate was collected by filtration to give the title compound (5 g).

Workup

  1. addition5% palladium carbon-ethylenediamine complex (2 g) was added
  2. filtrationAfter celite filtration
  3. customthe solvent in the filtrate was evaporated

Sources & evidence

ORD record
ord-35e863f198764468918d3f57971268da
Source dataset
uspto-grants-2013_01
Patent number
US08354401B2

Reaction notes

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