Dimethyl Sulfoxide → 2,4-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-2-(1-methylethyl)-3H-1,2,4-triazol-3-one

HRID 2073168Notes

Reaction equation

HRID 2073168 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH2:14][CH2:13][N:12]([C:15]3[CH:20]=[CH:19][C:18]([N:21]4[CH:25]=[N:24][NH:23][C:22]4=[O:26])=[CH:17][CH:16]=3)[CH2:11][CH2:10]2)=[CH:5][CH:4]=1.[H-].[Na+].CS(C)=O.Br[CH:34]([CH3:36])[CH3:35]>O>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH2:10][CH2:11][N:12]([C:15]3[CH:20]=[CH:19][C:18]([N:21]4[CH:25]=[N:24][N:23]([CH:34]([CH3:36])[CH3:35])[C:22]4=[O:26])=[CH:17][CH:16]=3)[CH2:13][CH2:14]2)=[CH:5][CH:4]=1

Participants

6

Reactant 4

HCID 679Dimethyl SulfoxideHCID 63582-Bromopropane2×HCID 24758Sodium hydride2×HCID 42465972,4-Dihydro-4-(4-(4-(4-methoxyphenyl)piperazin-1-yl)phenyl)-3H-1,2,4-triazol-3-one

Product 1

HCID 148553502,4-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-2-(1-methylethyl)-3H-1,2,4-triazol-3-oneYield 47%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 10 parts of 2,4-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-3H-1,2,4-triazol-3-one, prepared as described in Example XVII of U.S. Pat. No. 4,267,179, 1.5 parts of a sodium hydride dispersion 50% and 300 parts of dimethyl sulfoxide was stirred at 60° C. under nitrogen atmosphere till foaming had ceased. Then there were added 5.24 parts of 2-bromopropane and stirring was continued for 1 hour at 60° C. Another 1.5 parts of a sodium hydride dispersion 50% was added and stirring was continued till foaming had ceased. Then another 5.24 parts of 2-bromopropane was aded and the whole was stirred for 1 hour at 60° C. The reaction mixture was cooled and poured into water. The product was extracted with trichloromethane. The extract was washed with water, dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (99:1 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from 1-butanol, yielding 5.2 parts (47%) of 2,4-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]- 2-(1-methylethyl)-3H-1,2,4-triazol-3-one; mp. 209.5° C. (intermediate 9).

Workup

  1. customprepared
  2. stirringstirring
  3. stirringthe whole was stirred for 1 hour at 60° C
  4. temperatureThe reaction mixture was cooled
  5. extractionThe product was extracted with trichloromethane
  6. washThe extract was washed with water
  7. customdried
  8. filtrationfiltered
  9. customevaporated
  10. customThe residue was purified by column chromatography over silica gel using
  11. additiona mixture of trichloromethane and methanol (99:1 by volume) as eluent
  12. customThe pure fractions were collected
  13. customthe eluent was evaporated
  14. customThe residue was crystallized from 1-butanol

Sources & evidence

ORD record
ord-88a958df7180426d8e181aa9bb478e4a
Source dataset
uspto-grants-1990_04
Patent number
US04916134

Reaction notes

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