Hydrochloric Acid → 1-Isobutyl-5-nitro-1,2-dihydro-indazol-3-one

HRID 490555Notes

Reaction equation

HRID 490555 reaction equation
F[C:2]1[CH:10]=[CH:9][C:8]([N+:11]([O-:13])=[O:12])=[CH:7][C:3]=1[C:4]([OH:6])=O.CCN=C=NCCCN(C)C.Cl.C(N(C(C)C)C(C)C)C.[CH2:35]([NH:39][NH2:40])[CH:36]([CH3:38])[CH3:37].C1(C)C=CC(S(O)(=O)=O)=CC=1.Cl>CN(C=O)C>[CH2:35]([N:39]1[C:2]2[C:3](=[CH:7][C:8]([N+:11]([O-:13])=[O:12])=[CH:9][CH:10]=2)[C:4](=[O:6])[NH:40]1)[CH:36]([CH3:38])[CH3:37]

Participants

8

Reactant 6

HCID 313Hydrochloric AcidHCID 6101p-Toluenesulfonic acidHCID 81531DiisopropylethylamineHCID 2809972-Fluoro-5-nitrobenzoic acidHCID 542420IsobutylhydrazineHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Product 1

HCID 688321981-Isobutyl-5-nitro-1,2-dihydro-indazol-3-one

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 2-fluoro-5-nitrobenzoic acid (1.5 g) in DMF (50 mL) was added EDCI.HCl (1.71 g) followed by N-ethyldiisopropylamine (5.51 mL). After 10 minutes isobutylhydrazine.p-toluenesulfonicacid salt (2.32 g) was added. The reaction mixture was stirred at ambient temperature for 22 hours and the reaction was poured onto aqueous 1N HCl solution and extracted with EtOAc. The organic layer was washed with brine, dried over sodium sulfate, filtered and evaporated in vacuo. Purification via ISCO combiflash chromatography afforded pure desired 1-isobutyl-5-nitro-1,2-dihydro-indazol-3-one (0.9 g) as a yellow solid. MS (ESI−):234.1 ([M−H]−).

Workup

  1. extractionextracted with EtOAc
  2. washThe organic layer was washed with brine
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. customevaporated in vacuo
  6. customPurification via ISCO combiflash chromatography

Sources & evidence

ORD record
ord-e956eafa48094ea0b08f141676cf46a9
Source dataset
uspto-grants-2009_05
Patent number
US07528158B2

Reaction notes

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