Nitric Acid → HCID 14625290, compound

HRID 2352455Notes

Reaction equation

HRID 2352455 reaction equation
[Cl:1][C:2]1[N:3]([C:11]2[CH:16]=[CH:15][C:14]([F:17])=[CH:13][C:12]=2[F:18])[N:4]=[C:5]2[C:10]=1[CH2:9][CH2:8][CH2:7][CH2:6]2.[N+:19]([O-])([OH:21])=[O:20]>S(=O)(=O)(O)O>[Cl:1][C:2]1[N:3]([C:11]2[CH:16]=[C:15]([N+:19]([O-:21])=[O:20])[C:14]([F:17])=[CH:13][C:12]=2[F:18])[N:4]=[C:5]2[C:10]=1[CH2:9][CH2:8][CH2:7][CH2:6]2

Participants

4

Reactant 2

HCID 944Nitric AcidHCID 146252893-Chloro-2-(2,4-difluorophenyl)-4,5,6,7-tetrahydro-2H-indazole

Product 1

HCID 14625290HCID 14625290, compoundYield 89.6%

Reagents, catalysts & solvents 1

HCID 1118Sulfuric AcidSolvent

Procedure

A solution of 3-chloro-2-(2,4-difluorophenyl)-4,5,6,7-tetrahydro-2H-indazole (217 g) in conc. sulfuric acid (1 kg) was cooled to 5° C., and 99% nitric acid (67 g) was dropwise added thereto at a temperature below about 10° C., followed by stirring for 3 hours. After completion of the reaction, the reaction mixture was added to ice-water (10 kg), and the precipitated crystals were collected by filtration, washed and dried to give 3-chloro-2-(2,4-difluoro-5-nitrophenyl)-4,5,6,7-tetrahydro-2H-indazole (227 g). m.p., 117°-118° C. (decomp.).

Workup

  1. customat a temperature below about 10° C.
  2. customAfter completion of the reaction
  3. filtrationthe precipitated crystals were collected by filtration
  4. washwashed
  5. customdried

Sources & evidence

ORD record
ord-8e8e404e679944738bf4f8fc8cd7a33d
Source dataset
uspto-grants-1989_10
Patent number
US04877444

Reaction notes

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