Tributylvinyltin → 2,2-Dimethyl-N-(5-vinylpyridin-2-yl)-propionamide

HRID 2420867Notes

Reaction equation

HRID 2420867 reaction equation
[CH2:1]([Sn](CCCC)(CCCC)C=C)[CH2:2]CC.Br[C:17]1[CH:18]=[CH:19][C:20]([NH:23][C:24](=[O:29])[C:25]([CH3:28])([CH3:27])[CH3:26])=[N:21][CH:22]=1>C1(C)C=CC=CC=1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:1]([C:17]1[CH:18]=[CH:19][C:20]([NH:23][C:24](=[O:29])[C:25]([CH3:28])([CH3:27])[CH3:26])=[N:21][CH:22]=1)=[CH2:2]

Participants

5

Reactant 2

HCID 81998TributylvinyltinHCID 15461537N-(5-bromopyridin-2-yl)-2,2-dimethylpropanamide

Product 1

HCID 217020792,2-Dimethyl-N-(5-vinylpyridin-2-yl)-propionamideYield 80.4%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent

Procedure

Tributyl(vinyl)stannane (50 g, 0.16 mol), Pd(Ph3P)4 (3.3 g, 2.9 mmol) and a catalytic amount of 2,6-t-butyl-4-methylphenol was added to a solution of N-(5-bromopyridin-2-yl)pivalamide (36 g, 0.14 mol) in toluene. The reaction mixture was heated at reflux for 48 h. The solvent was evaporated in vacuo and the residue was purified by chromatography on silica gel (5% EtOAc in petroleum ether) to afford N-(5-vinylpyridin-2-yl)pivalamide (23 g, 80% yield). 1H NMR (CDCl3, 300 MHz) δ 8.24-8.20 (m, 2H), 8.02 (br s, 1H), 7.77 (dd, J=8.7 and 2.4, 1H), 6.65 (dd, J=17.7 and 10.8, 1H), 5.73 (d, J=17.7, 1H), 5.29 (d, J=10.8, 1H), 1.32 (s, 9H).

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureat reflux for 48 h
  3. customThe solvent was evaporated in vacuo
  4. customthe residue was purified by chromatography on silica gel (5% EtOAc in petroleum ether)

Sources & evidence

ORD record
ord-7ac49df49c0d46d2a6073303daa37728
Source dataset
uspto-grants-2011_06
Patent number
US07956052B2

Reaction notes

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