Sulfuric Acid → HCID 23048179, compound

HRID 986176Notes

Reaction equation

HRID 986176 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-1carbonitrile 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-bda5001ab1bc48dda2ea2c9a3bde5410
Source dataset
uspto-grants-1987_12
Patent number
US04710573

Reaction notes

Loading…