Sodium Bicarbonate → 5-Amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-propanoylpyrazole

HRID 376227Notes

Reaction equation

HRID 376227 reaction equation
O.C1(C)C=CC(S(O)(=O)=[O:9])=CC=1.[NH2:13][C:14]1[N:18]([C:19]2[C:24]([Cl:25])=[CH:23][C:22]([C:26]([F:29])([F:28])[F:27])=[CH:21][C:20]=2[Cl:30])[N:17]=[C:16]([C:31]#[N:32])[C:15]=1[C:33]#[C:34][CH3:35].C(=O)(O)[O-].[Na+]>C(#N)C>[NH2:13][C:14]1[N:18]([C:19]2[C:20]([Cl:30])=[CH:21][C:22]([C:26]([F:28])([F:27])[F:29])=[CH:23][C:24]=2[Cl:25])[N:17]=[C:16]([C:31]#[N:32])[C:15]=1[C:33](=[O:9])[CH2:34][CH3:35]

Participants

5

Reactant 3

HCID 516892Sodium BicarbonateHCID 521998p-Toluenesulfonic acid monohydrate3×HCID 221733795-Amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-(prop-1-ynyl)pyrazole

Product 1

HCID 186994405-Amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-propanoylpyrazole

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent2×

Procedure

p-Toluenesulphonic acid monohydrate (2.92 g) was added to a stirred solution of 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-(prop-1-yn-1-yl)pyrazole (WO-A-97/07102; 2.1 g) in acetonitrile (40 ml) and the mixture stirred at room temperature for 1 hour. Further p-toluenesulphonic acid monohydrate (1.0) was added and this mixture stirred at room temperature for 16 hours. Further acetonitrile (20 ml) and yet more p-toluenesulphonic acid monohydrate (1.0 g) were added and stirring continued for 1 hour, then the reaction mixture was poured into saturated aqueous sodium bicarbonate solution (500 ml) and extracted with ether (2×100 ml). The combined organic extracts were washed with brine (100 ml), dried (Na2SO4) and evaporated under reduced pressure, then the residue purified by column chromatography on silica gel (70 g), using dichloromethane as eluant, to yield the title compound as a pale brown solid, m.p. 167-169° C. δ (CDCl3): 1.26 (t,3H), 3.03 (q,2H), 5.83 (br.s,2H), 7.80 (s,2H). MS (thermospray): M/Z [M+H] 377.2; C14H9Cl2F3N4O+H requires 377.0.

Workup

  1. stirringthis mixture stirred at room temperature for 16 hours
  2. stirringstirring
  3. waitcontinued for 1 hour
  4. extractionextracted with ether (2×100 ml)
  5. washThe combined organic extracts were washed with brine (100 ml)
  6. dry with materialdried (Na2SO4)
  7. customevaporated under reduced pressure
  8. customthe residue purified by column chromatography on silica gel (70 g)

Sources & evidence

ORD record
ord-c54a03df07824535af619e20eba02728
Source dataset
uspto-grants-2000_02
Patent number
US06019986

Reaction notes

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