Hydrochloric Acid → 1-(3,4-dichlorophenyl)-N-(2-morpholinoethyl)-1H-pyrazol-3-amine

HRID 1669534Notes

Reaction equation

HRID 1669534 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[CH:13]=[CH:12][C:11]([NH:14][C:15](=O)[CH2:16][N:17]3[CH2:22][CH2:21][O:20][CH2:19][CH2:18]3)=[N:10]2)[CH:5]=[CH:6][C:7]=1[Cl:8].CSC.B.O.Cl>O1CCCC1.CO>[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[CH:13]=[CH:12][C:11]([NH:14][CH2:15][CH2:16][N:17]3[CH2:18][CH2:19][O:20][CH2:21][CH2:22]3)=[N:10]2)[CH:5]=[CH:6][C:7]=1[Cl:8]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 962WaterHCID 12423031(Dimethyl sulfide)trihydroboronHCID 24743570N-(1-(3,4-dichlorophenyl)-1H-pyrazol-3-yl)-2-morpholinoacetamide

Product 1

HCID 247435681-(3,4-dichlorophenyl)-N-(2-morpholinoethyl)-1H-pyrazol-3-amineYield 55.5%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

To an ice cooled solution of N-(1-(3,4-dichlorophenyl)-1H-pyrazol-3-yl)-2-morpholinoacetamide (0.1 g, 0.28 mmol) in dry tetrahydrofurane (4 ml), in a dry nitrogen atmosphere, was dropwise added a 2M solution of borane dimethylsulfide in THF (0.7 ml, 1.4 mmol). The solution was slowly warmed to reflux, refluxed 4 hrs and additionally stirred at room temperature for 16 hrs. The mixture was ice cooled while water (2 ml) and 6M HCl (0.5 ml) cautiously added and, then, refluxed for 2 hrs. Solvents were coevaporated with methanol to dryness in vacuo. The crude residue was partitioned between 10% NaOH aqueous solution and ethyl acetate. The combined organic phases were washed with water, dried over sodium sulphate, filtered and evaporated to dryness yielding 94 mg of crude compound which was purified by column chromatography on silica gel (eluent:petroleum ether/ethyl acetate 50:50 to ethylacetate 100%). 1-(3,4-Dichlorophenyl)-N-(2-morpholinoethyl)-1H-pyrazol-3-amine (53 mg) was obtained as an oil.

Workup

  1. temperatureThe solution was slowly warmed
  2. temperatureto reflux
  3. temperaturerefluxed 4 hrs
  4. additioncautiously added
  5. temperaturerefluxed for 2 hrs
  6. customThe crude residue was partitioned between 10% NaOH aqueous solution and ethyl acetate
  7. washThe combined organic phases were washed with water
  8. dry with materialdried over sodium sulphate
  9. filtrationfiltered
  10. customevaporated to dryness
  11. customyielding 94 mg of crude compound which
  12. customwas purified by column chromatography on silica gel (eluent:petroleum ether/ethyl acetate 50:50 to ethylacetate 100%)

Sources & evidence

ORD record
ord-8b983b5b7b8d4fe4897b5ef5cd015bc4
Source dataset
uspto-grants-2011_08
Patent number
US07989485B2

Reaction notes

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