Sulfuric Acid → HCID 23048179, compound

HRID 652188Notes

Reaction equation

HRID 652188 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-trifluoromethylphenyl)-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 which yielded 13 g (93%) of 1-[4-(trifluoromethyl)phenyl]-3-(4-piperidinyl)-1H-indazole as an oil. A mixture of formic acid (1 ml, 0.027 moles) and acetic anhydride (2.4 ml, 0.025 moles) was warmed at 55° C. for 1.5 hours. The solution was cooled to 30° C. and a suspension of the indazole (4.0 g, 0.012 moles) in ether (10 ml) was added. The mixture was stirred at ambient temperature for 3.5 hours and then poured into H2O and basified with a 5% NaOH solution. The product was extracted (CHCl3), dried (MgSO4) and concentrated to yield 5.1 g of an oil. The oil was purified on the high pressure liquid chromatograph (silica gel, 100% ethyl acetate) to yield 3.1 g (72%) of 1-formyl-4-[1-[4-(trifluoromethyl)phenyl]-1H-indazol-3-yl]piperidine, m.p. 109°-111° 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 which

Sources & evidence

ORD record
ord-61a576d1dbc5472bb7bc411869efbf47
Source dataset
uspto-grants-1987_06
Patent number
US04670447

Reaction notes

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