Hydrochloric Acid → Methyl 6-[1-(6-cyanopyridin-3-yl)-1H-pyrazol-5-yl]-5-methyl-3-oxo-4-[3-(trifluoromethyl)phenyl]-3,4-dihydropyrazine-2-carboxylate

HRID 1958302Notes

Reaction equation

HRID 1958302 reaction equation
C(O[CH:4](OCC)[C:5]#[C:6][C:7]1[N:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[C:10](=[O:17])[N:9]([C:18]2[CH:23]=[CH:22][CH:21]=[C:20]([C:24]([F:27])([F:26])[F:25])[CH:19]=2)[C:8]=1[CH3:28])C.FC(F)(F)C(O)=O.[NH:39]([C:41]1[CH:42]=[CH:43][C:44]([C:47]#[N:48])=[N:45][CH:46]=1)[NH2:40].Cl.C([O-])(O)=O.[Na+]>O1CCOCC1>[C:47]([C:44]1[N:45]=[CH:46][C:41]([N:39]2[C:6]([C:7]3[N:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[C:10](=[O:17])[N:9]([C:18]4[CH:23]=[CH:22][CH:21]=[C:20]([C:24]([F:25])([F:27])[F:26])[CH:19]=4)[C:8]=3[CH3:28])=[CH:5][CH:4]=[N:40]2)=[CH:42][CH:43]=1)#[N:48]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 516892Sodium BicarbonateHCID 59564940Methyl 6-(3,3-diethoxyprop-1-ynyl)-5-methyl-3-oxo-4-(3-(trifluoromethyl)phenyl)-3,4-dihydropyrazine-2-carboxylateHCID 667386805-Hydrazinopyridine-2-carbonitrile trifluoroacetate

Product 1

HCID 66738829Methyl 6-[1-(6-cyanopyridin-3-yl)-1H-pyrazol-5-yl]-5-methyl-3-oxo-4-[3-(trifluoromethyl)phenyl]-3,4-dihydropyrazine-2-carboxylateYield 28.2%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Conditions

Temperature
55 °C

Procedure

Methyl 6-(3,3-diethoxyprop-1-ynyl)-5-methyl-3-oxo-4-[3-(trifluoromethyl)phenyl]-3,4-dihydropyrazine-2-carboxylate (0.073 g, 0.17 mmol) and 5-hydrazinopyridine-2-carbonitrile trifluoroacetate (0.050 g, 0.20 mmol) in dioxane (3 ml) were placed in a vial. 2M HCl (0.188 ml) was added and the mixture was stirred at 55° C. for 15 min. After cooling, NaHCO3 (0.048 g) was added and the mixture was extracted with DCM and water. The combined organic phases were washed with water, brine, dried (Na2SO4) and evaporated. The residue was dissolved in acetic acid (10 ml) and the vial was sealed. The solution was stirred at 90° C. for 10 h. After evaporation, the residue was purified by preparative HPLC to give 0.023 g (28%) of the title compound.

Workup

  1. temperatureAfter cooling
  2. extractionthe mixture was extracted with DCM and water
  3. washThe combined organic phases were washed with water, brine
  4. dry with materialdried (Na2SO4)
  5. customevaporated
  6. dissolutionThe residue was dissolved in acetic acid (10 ml)
  7. customthe vial was sealed
  8. stirringThe solution was stirred at 90° C. for 10 h
  9. customAfter evaporation
  10. customthe residue was purified by preparative HPLC

Sources & evidence

ORD record
ord-7b497569e14b4b669cdadb8398274017
Source dataset
uspto-grants-2013_04
Patent number
US08410114B2

Reaction notes

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