Hydrazine → HCID 11241897, compound

HRID 2242538Notes

Reaction equation

HRID 2242538 reaction equation
BrC1C=CC(Br)=CN=1.NN.[Br:11][C:12]1[CH:13]=[CH:14][C:15]([NH:18]N)=[N:16][CH:17]=1.N(C1C=CC=CN=1)N.[CH3:28][CH:29]([CH3:33])[C:30](=O)[CH3:31]>COCCO.C1C=CC=CC=1>[Br:11][C:12]1[CH:13]=[C:14]2[C:29]([CH3:33])([CH3:28])[C:30]([CH3:31])=[N:18][C:15]2=[N:16][CH:17]=1

Participants

8

Reactant 5

HCID 9321HydrazineHCID 112513-Methyl-2-butanoneHCID 693532,5-DibromopyridineHCID 786452-HydrazinopyridineHCID 115356995-Bromo-2-hydrazinopyridine

Product 1

HCID 11241897HCID 11241897, compound

Reagents, catalysts & solvents 2

HCID 241BenzeneSolventHCID 80192-MethoxyethanolSolvent

Conditions

Temperature
110 °C

Procedure

To 40 g of 2,5-dibromopyridine in 200 mL of 2-methoxyethanol is added 53 mL of anhydrous hydrazine and the mixture is heated at 110° C. for 3 hours to generate the 5-bromo-2-hydrazinopyridine. A mixture of 10 g of this hydrazinopyridine is heated at reflux overnight with 11 mL of 3-methyl-2-butanone in 40 mL of benzene equipped, using a condenser equipped with a Dean-Stark trap. All of the volatile components are removed under reduced pressure and the resulting residue is heated in 62 g of polyphosphoric acid at 140° C. for 45 minutes. The reaction mixture is poured into water, neutralized with sodium hydroxide and extracted with ethyl acetate. The resulting crude residue is purified by chromatography on silica gel, eluting with 1:1 ethyl acetate/hexanes, to yield 1.44 g of the product.

Workup

  1. temperatureis heated
  2. customequipped
  3. customequipped with a Dean-Stark trap
  4. customAll of the volatile components are removed under reduced pressure
  5. temperaturethe resulting residue is heated in 62 g of polyphosphoric acid at 140° C. for 45 minutes
  6. additionThe reaction mixture is poured into water
  7. extractionextracted with ethyl acetate
  8. customThe resulting crude residue is purified by chromatography on silica gel
  9. washeluting with 1:1 ethyl acetate/hexanes

Sources & evidence

ORD record
ord-3e576a83862a4edf8b9b6b1d5f625c12
Source dataset
uspto-grants-2010_03
Patent number
US07671214B2

Reaction notes

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