(Phenylmethyl)hydrazine → HCID 178519612, compound

HRID 2182498Notes

Reaction equation

HRID 2182498 reaction equation
[CH2:1]([N:8]1C2C(=CC=CC=2)C(C2OC(C(O)=O)=CC=2)=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[K].[F:26][C:27]1[CH:42]=[CH:41][CH:40]=[CH:39][C:28]=1[C:29]([C:31]1[O:35][C:34]([C:36]([OH:38])=O)=[CH:33][CH:32]=1)=[O:30].C(NN)C1C=CC=CC=1>CO.C(O)(=O)C>[CH2:1]([NH:8][N:9]=[C:36]([C:34]1[O:35][C:31]([C:29](=[O:30])[C:28]2[CH:39]=[CH:40][CH:41]=[CH:42][C:27]=2[F:26])=[CH:32][CH:33]=1)[OH:38])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

7

Reactant 4

HCID 11157(Phenylmethyl)hydrazineHCID 5462222PotassiumHCID 10925187HCID 10925187, compoundHCID 15408135HCID 15408135, compound

Product 1

HCID 178519612HCID 178519612, compound

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 887MethanolSolvent

Procedure

1-Benzyl-3-(5-carboxy-2-furyl)indazole, potassium salt: 70.26 g (0.3 mol) of 5-(2-fluorobenzoyl)furan-2-carboxylic acid were initially charged in 350 ml of methanol, 109.95 g (0.9 mol) of benzylhydrazine were added and the mixture was, after addition of 8 ml of glacial acetic acid, heated under reflux for 6 h. For work-up, the mixture was concentrated using a rotary evaporator, the residue was taken up in 2 N aqueous sodium hydroxide solution and extracted with ethyl acetate. The aqueous phase was acidified with 2 N hydrochloric acid and extracted with ethyl acetate. The residue that remained after drying and concentration using a rotary evaporator was recrystallized from ethyl acetate/n-hexane. The 68.3 g (0.20 mol) of 5-(2-fluorobenzoyl)furan-2-carboxylic acid benzylhydrazone (m.p.: 147° C. (decomp.)) obtained in this manner were dissolved in 400 ml of DMF, 45.38 g (0.40 mol) of potassium tert-butoxide were introduced and the mixture was heated under reflux for 30 minutes. The precipitate was filtered off with suction, washed with dichloromethane and recrystallized from ethanol/water (95:5). This gave 57.7 g (54%) of the title compound. The corresponding cyclization of the precursor which was still contained in the mother liquor gave 25.9 g of product. m.p.: >300° C.

Workup

  1. temperatureheated
  2. temperatureunder reflux for 6 h
  3. concentrationFor work-up, the mixture was concentrated
  4. customa rotary evaporator
  5. extractionextracted with ethyl acetate
  6. extractionextracted with ethyl acetate
  7. customafter drying
  8. concentrationconcentration
  9. customa rotary evaporator
  10. customwas recrystallized from ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-5ed37bab5e134403ad8e5eedec92bf98
Source dataset
uspto-grants-2005_05
Patent number
US06897232B2

Reaction notes

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