Sulfuric Acid → HCID 23048179, compound

HRID 867740Notes

Reaction equation

HRID 867740 reaction equation
[F:1][C:2]([F:27])([F:26])[C:3]1[CH:8]=[CH:7][C:6]([N:9]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[C:11]([CH:18]3[CH2:23][CH2:22][N:21](C#N)[CH2:20][CH2:19]3)=[N:10]2)=[CH:5][CH:4]=1.OS(O)(=O)=O.[OH-].[Na+]>O>[F:27][C:2]([F:1])([F:26])[C:3]1[CH:8]=[CH:7][C:6]([N:9]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[C:11]([CH:18]3[CH2:19][CH2:20][NH:21][CH2:22][CH2:23]3)=[N:10]2)=[CH:5][CH:4]=1

Participants

5

Reactant 3

HCID 1118Sulfuric AcidHCID 14798Sodium HydroxideHCID 14032656HCID 14032656, compound

Product 1

HCID 23048179HCID 23048179, compoundYield 93%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A stirred mixture of 4-[1-[4-(trifluoromethyl)phenyl]-1H-indazol-3-yl]piperidine-1-carbonitrile of Example 101 (15 g, 0.041 moles) and 25% H2SO4 (100 ml) was refluxed for 20 hours. The mixture was cooled, poured into H2O, and basified with a 25% NaOH solution. The product was extracted (dichloromethane), dried (MgSO4), and concentrated to yield 13 g (93%) of 1-[4-(trifluoromethyl)phenyl]-3-(4-piperidinyl)-1H-indazole as an oil. A stirred mixture of the indazole (4.0 g, 0.012 moles), potassium carbonate (3.6 g, 0.026 moles) and chloromethyldimethyl phosphine oxide (3.96 g, 0.031 moles) in DMF (30 ml) was heated at 80° C. for 40 hours. The mixture was cooled, poured into H2O, extracted (CHCl3), dried (MgSO4) and concentrated to yield 4.8 g of an oil. The product was purified on the HPLC (silica gel, 5% methanol-CHCl3) and then recrystallized once from acetone-hexane to yield 2.2 g (35%) of 1-[4-(trifluoromethyl)phenyl]-3-[1-(dimethylphosphinyl methyl)-4-piperidinyl]-1H-indazole, m.p. 158°-160° C.

Workup

  1. temperaturewas refluxed for 20 hours
  2. temperatureThe mixture was cooled
  3. extractionThe product was extracted (dichloromethane)
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-513e900d379c48859520d4aa4e539165
Source dataset
uspto-grants-1988_10
Patent number
US04775761

Reaction notes

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