Hydrazine → 4-(2-Fluoro-4-methylphenylamino)-1,3-dimethyl-7,8-dihydro-1H,6H-pyrido[2,3-d]pyridazine-2,5-dione

HRID 1971200Notes

Reaction equation

HRID 1971200 reaction equation
C([O:3][C:4]([C:6]1[C:11]([NH:12][C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][C:14]=2[F:20])=[C:10]([CH3:21])[C:9](=[O:22])[N:8]([CH3:23])[C:7]=1[CH2:24]Br)=O)C.[NH2:26][NH2:27]>CO.CCOC(C)=O>[F:20][C:14]1[CH:15]=[C:16]([CH3:19])[CH:17]=[CH:18][C:13]=1[NH:12][C:11]1[C:6]2[C:4](=[O:3])[NH:27][NH:26][CH2:24][C:7]=2[N:8]([CH3:23])[C:9](=[O:22])[C:10]=1[CH3:21]

Participants

5

Reactant 2

HCID 9321HydrazineHCID 666734472-Bromomethyl-4-(2-fluoro-4-methylphenylamino)-1,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid ethyl ester

Product 1

HCID 576368604-(2-Fluoro-4-methylphenylamino)-1,3-dimethyl-7,8-dihydro-1H,6H-pyrido[2,3-d]pyridazine-2,5-dione

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 2-bromomethyl-4-(2-fluoro-4-methylphenylamino)-1,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid ethyl ester (1 equivalent) in MeOH is added hydrazine (1.10 equivalents). After stirring for 2 hours at room temperature, the reaction mixture is heated to 40° C. for 8 hours. The reaction mixture is diluted with EtOAc and washed with water. The organic layer is dried over MgSO4, filtered, and concentrated in vacuo to give the crude material that is purified by trituration or flash column chromatography to afford the desired product as necessary.

Workup

  1. temperaturethe reaction mixture is heated to 40° C. for 8 hours
  2. washwashed with water
  3. dry with materialThe organic layer is dried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customto give the crude material that
  7. customis purified by trituration or flash column chromatography

Sources & evidence

ORD record
ord-f47aa31c5c3b4f1dbd7d86cfc7c5cca0
Source dataset
uspto-grants-2013_04
Patent number
US08431574B2

Reaction notes

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