2,6-dichloro-alpha-(4-chlorophenyl)-4-(4,5-dihydro-3,5-dioxo-1,2,4-triazin-2(3H)-yl)-benzeneacetic acid → 2,6-dichloro-alpha-(4-chlorophenyl)-4-(3,4,5,6-tetrahydro-3,5-dioxo-1,2,4-triazin-2(1H)-yl)benzeneacetic acid

HRID 1165853Notes

Reaction equation

HRID 1165853 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([N:8]2[C:13](=[O:14])[NH:12][C:11](=[O:15])[CH:10]=[N:9]2)[CH:5]=[C:4]([Cl:16])[C:3]=1[CH:17]([C:21]1[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][CH:22]=1)[C:18]([OH:20])=[O:19]>[Zn].C(O)(=O)C>[Cl:1][C:2]1[CH:7]=[C:6]([N:8]2[C:13](=[O:14])[NH:12][C:11](=[O:15])[CH2:10][NH:9]2)[CH:5]=[C:4]([Cl:16])[C:3]=1[CH:17]([C:21]1[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][CH:22]=1)[C:18]([OH:20])=[O:19]

Participants

4

Reactant 1

HCID 230351982,6-dichloro-alpha-(4-chlorophenyl)-4-(4,5-dihydro-3,5-dioxo-1,2,4-triazin-2(3H)-yl)-benzeneacetic acid

Product 1

HCID 230351942,6-dichloro-alpha-(4-chlorophenyl)-4-(3,4,5,6-tetrahydro-3,5-dioxo-1,2,4-triazin-2(1H)-yl)benzeneacetic acidYield 67.2%

Reagents, catalysts & solvents 2

HCID 23994ZincCatalystHCID 176Acetic AcidSolvent

Procedure

To a stirred and refluxed solution of 1.5 parts of 2,6-dichloro-α-(4-chlorophenyl)-4-(4,5-dihydro-3,5-dioxo-1,2,4-triazin-2(3H)-yl)-benzeneacetic acid in 100 parts of acetic acid were added 3 parts of zinc. Stirring was continued for 30 minutes at reflux temperature. The zinc salts were filtered off and the filtrate was evaporated. The residue was washed with water whereupon the solid product was filtered off and dissolved in a mixture of trichloromethane and methanol (90:10 by volume). The solution was dried, filtered and evaporated. The residue was washed with ethyl acetate and 2,2'-oxybispropane and dried, yielding 0.98 parts (67.2%) of 2,6-dichloro-α-(4-chlorophenyl)-4-(3,4,5,6-tetrahydro-3,5-dioxo-1,2,4-triazin-2(1H)-yl)benzeneacetic acid; mp. 194.2° C. (compound 1).

Workup

  1. stirringStirring
  2. temperatureat reflux temperature
  3. filtrationThe zinc salts were filtered off
  4. customthe filtrate was evaporated
  5. washThe residue was washed with water whereupon the solid product
  6. filtrationwas filtered off
  7. dissolutiondissolved in a mixture of trichloromethane and methanol (90:10 by volume)
  8. customThe solution was dried
  9. filtrationfiltered
  10. customevaporated
  11. washThe residue was washed with ethyl acetate and 2,2'-oxybispropane
  12. customdried

Sources & evidence

ORD record
ord-3716c3fd1a3b4a139e02af2726b5ea93
Source dataset
uspto-grants-1990_03
Patent number
US04912106

Reaction notes

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