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Thionyl Chloride → 2-Ethyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-5-carbonyl)-phenyl]-amide

HRID 2352756
Notes
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Reaction equation

HRID 2352756 reaction equation
[CH2:1]([N:3]1[C:7]([C:8]([OH:10])=O)=[CH:6][C:5]([CH3:11])=[N:4]1)[CH3:2].S(Cl)(Cl)=O.[NH2:16][C:17]1[CH:18]=[C:19]([CH:32]=[CH:33][CH:34]=1)[C:20]([C:22]1[CH:23]=[C:24]2[C:28](=[CH:29][CH:30]=1)[NH:27][C:26](=[O:31])[CH2:25]2)=[O:21]>C1COCC1>[O:31]=[C:26]1[CH2:25][C:24]2[C:28](=[CH:29][CH:30]=[C:22]([C:20]([C:19]3[CH:18]=[C:17]([NH:16][C:8]([C:7]4[N:3]([CH2:1][CH3:2])[N:4]=[C:5]([CH3:11])[CH:6]=4)=[O:10])[CH:34]=[CH:33][CH:32]=3)=[O:21])[CH:23]=2)[NH:27]1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 24386Thionyl ChlorideHCID 27437941-Ethyl-3-methyl-1H-pyrazole-5-carboxylic acidHCID 644240015-(3-Amino-benzoyl)-1,3-dihydro-indol-2-one

Product 1

HCID 866103712-Ethyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-5-carbonyl)-phenyl]-amideYield 76%

Reagents, catalysts & solvents 1

HCID 8028
Tetrahydrofuran
Solvent

Conditions

Temperature
79 °C

Procedure

A dry 25 mL flask was charged with 2-Ethyl-5-methyl-2H-pyrazole-3-carboxylic acid (0.802 g, 4.67 mmol) and thionyl chloride (10 mL) and allowed to stir at 79° C. for 2 h. The thionyl chloride was then removed by distillation. The crude acid chloride was cooled to room temperature, and then dissolved in THF (5 mL). 5-(3-Amino-benzoyl)-1,3-dihydro-indol-2-one (0.905 g, 3.59 mmol) was added to the THF solution of the acid chloride, and the mixture was allowed to reflux for 2 h. The reaction mixture was then allowed to cool to room temperature. The room temperature reaction mixture was concentrated in vacuo, and the crude residue was dissolved in EtOH (5 mL). The ethanolic solution was treated with 1M NaOH(aq) (2 mL) and stirred for 30 min. The basic solution was acidified to a pH of 1 with 1M HCl(aq) yielding a tan precipitate. The tan solids were filtered to afford the pure 2-Ethyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-5-carbonyl)-phenyl]-amide (1.05 g, 2.73 mmol, 76%).

Workup

  1. customThe thionyl chloride was then removed by distillation
  2. temperatureThe crude acid chloride was cooled to room temperature
  3. dissolutiondissolved in THF (5 mL)
  4. temperatureto reflux for 2 h
  5. temperatureto cool to room temperature
  6. customThe room temperature reaction mixture
  7. concentrationwas concentrated in vacuo
  8. dissolutionthe crude residue was dissolved in EtOH (5 mL)
  9. additionThe ethanolic solution was treated with 1M NaOH(aq) (2 mL)
  10. stirringstirred for 30 min
  11. customyielding a tan precipitate
  12. filtrationThe tan solids were filtered

Sources & evidence

ORD record
ord-07eac9c9f1e647c5b0492501e835e706
Source dataset
uspto-grants-2010_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07749530B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes