Hydrochloric Acid → 3-Pyridinecarboxamide, 5-acetyl-

HRID 2307770Notes

Reaction equation

HRID 2307770 reaction equation
Br[C:2]1[CH:3]=[N:4][CH:5]=[C:6]([CH:10]=1)[C:7]([NH2:9])=[O:8].C([Sn](CCCC)(CCCC)[C:16]([O:18]CC)=[CH2:17])CCC.Cl>C1(C)C=CC=CC=1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[C:16]([C:2]1[CH:3]=[N:4][CH:5]=[C:6]([CH:10]=1)[C:7]([NH2:9])=[O:8])(=[O:18])[CH3:17]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 18085-BromonicotinamideHCID 619414Stannane, tributyl(1-ethoxyethenyl)-

Product 1

HCID 226073883-Pyridinecarboxamide, 5-acetyl-Yield 78.6%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 1140TolueneSolvent

Procedure

A mixture of 5-bromonicotinamide (2.5 g, 12.4 mmol), tributyl(1-ethoxyvinyl)tin (5.0 g, 13.8 mmol) and dichlorobis(triphenylphosphine)palladium(II) (800 mg, 1.1 mmol) in 25 mL toluene was heated to reflux for 3 hours. The mixture was cooled to room temperature, treated with 25 mL 2N HCl (aq.), and stirred for 1 hour. The aqueous layer was washed with ethyl acetate, adjusted to pH >7 with solid K2CO3, and extracted six times into 20% isopropanol/chloroform. The combined extracts were dried (Na2SO4), filtered, and concentrated to provide the desired product (1.6 g, 78%).

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 3 hours
  3. washThe aqueous layer was washed with ethyl acetate
  4. extractionextracted six times into 20% isopropanol/chloroform
  5. dry with materialThe combined extracts were dried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-20023b74a70d4ce796eac6aebf206170
Source dataset
uspto-grants-2004_12
Patent number
US06831175B2

Reaction notes

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