Cesium carbonate → 1-(2,2-Diethoxyethyl)-N-(2-methyl-5-nitrophenyl)-3-(pyridin-3-yl)-1H-pyrazole-5-amine

HRID 1055634Notes

Reaction equation

HRID 1055634 reaction equation
[CH2:1]([O:3][CH:4]([O:18][CH2:19][CH3:20])[CH2:5][N:6]1[C:10]([NH2:11])=[CH:9][C:8]([C:12]2[CH:13]=[N:14][CH:15]=[CH:16][CH:17]=2)=[N:7]1)[CH3:2].Br[C:22]1[CH:27]=[C:26]([N+:28]([O-:30])=[O:29])[CH:25]=[CH:24][C:23]=1[CH3:31].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH2:1]([O:3][CH:4]([O:18][CH2:19][CH3:20])[CH2:5][N:6]1[C:10]([NH:11][C:22]2[CH:27]=[C:26]([N+:28]([O-:30])=[O:29])[CH:25]=[CH:24][C:23]=2[CH3:31])=[CH:9][C:8]([C:12]2[CH:13]=[N:14][CH:15]=[CH:16][CH:17]=2)=[N:7]1)[CH3:2]

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 821892-Bromo-4-nitrotolueneHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 10516606HCID 10516606, compound

Product 1

HCID 897001021-(2,2-Diethoxyethyl)-N-(2-methyl-5-nitrophenyl)-3-(pyridin-3-yl)-1H-pyrazole-5-amine

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 312751,4-DioxaneSolvent

Procedure

Under argon, 155 g (561 mmol) of the compound of Example 4A together with 133 g (617 mmol) of 2-bromo-4-nitrotoluene, 12.6 g (56.1 mmol) of palladium(II) acetate, 48.7 g (84.1 mmol) of xantphos [4,5-bis(diphenylphosphino)-9,9-dimethylxanthene] and 548 g (1683 mmol) of caesium carbonate in 3.1 liters of 1,4-dioxane were heated at reflux. After 4 h, the mixture was cooled to RT and filtered through kieselguhr, and the filtrate was concentrated on a rotary evaporator. The crude product obtained in this manner was purified by filtration with suction through silica gel (mobile phase gradient ethyl acetate/petroleum ether 4:1→100% ethyl acetate). The product fractions were combined and freed from the solvent on a rotary evaporator. Trituration with diisopropyl ether at RT, removal of the solid by filtration with suction and drying under high vacuum gave 195 g (84% of theory) of the title compound.

Workup

  1. temperatureat reflux
  2. filtrationfiltered through kieselguhr
  3. concentrationthe filtrate was concentrated on a rotary evaporator
  4. customThe crude product obtained in this manner
  5. filtrationwas purified by filtration with suction through silica gel (mobile phase gradient ethyl acetate/petroleum ether 4:1→100% ethyl acetate)
  6. customfreed from the solvent on a rotary evaporator
  7. customTrituration with diisopropyl ether at RT, removal of the solid
  8. filtrationby filtration with suction
  9. customdrying under high vacuum

Sources & evidence

ORD record
ord-55605d09612f4c489ef7b6fe3b41c7f4
Source dataset
uspto-grants-2016_07
Patent number
US09394309B2

Reaction notes

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