Trifluoroacetic acid → N-isopropyl-2-(1-methyl-5-(trifluoromethoxy)-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

HRID 246368Notes

Reaction equation

HRID 246368 reaction equation
[CH:1]([NH:4][C:5]([C:7]1[C:15]2[C:10](=[N:11][CH:12]=[C:13]([C:16]3[C:24]4[C:19](=[CH:20][CH:21]=[C:22]([O:25][C:26]([F:29])([F:28])[F:27])[CH:23]=4)[N:18]([CH3:30])[N:17]=3)[N:14]=2)[N:9](COCC[Si](C)(C)C)[CH:8]=1)=[O:6])([CH3:3])[CH3:2].C(O)(C(F)(F)F)=O>ClCCl>[CH:1]([NH:4][C:5]([C:7]1[C:15]2[C:10](=[N:11][CH:12]=[C:13]([C:16]3[C:24]4[C:19](=[CH:20][CH:21]=[C:22]([O:25][C:26]([F:29])([F:27])[F:28])[CH:23]=4)[N:18]([CH3:30])[N:17]=3)[N:14]=2)[NH:9][CH:8]=1)=[O:6])([CH3:3])[CH3:2]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 71279818N-isopropyl-2-(1-methyl-5-(trifluoromethoxy)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

Product 1

HCID 71280189N-isopropyl-2-(1-methyl-5-(trifluoromethoxy)-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamideYield 91%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a slightly yellow clear solution of N-isopropyl-2-(1-methyl-5-(trifluoromethoxy)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (113 mg, 206 μmol) in dichloromethane (5 mL) was added TFA (1.48 g, 1.00 mL, 13.0 mmol), the reaction mixture was stirred overnight then concentrated. The residue was re-dissolved in 5 mL of a solution of dichloromethane/MeOH/ammonium hydroxide (60:10:1) and stirred at 25° C. for 3 h, then evaporated to a light yellow solid, dissolved in dichloromethane (containing a few drops of MeOH) and purified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% MeOH containing 10% ammonium hydroxide)/dichloromethane). The pure product was suspended in dichloromethane and cyclohexane added to promote solid formation, then the solid was separated by filtration and dried to give N-isopropyl-2-(1-methyl-5-(trifluoromethoxy)-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (78 mg, 186 μmol, 91%) as a white solid. MS (M+H)+=419; 1H NMR (DMSO-d6) δ: 12.86 (br. s., 1H), 9.12 (s, 1H), 8.42 (s, 1H), 8.34 (s, 1H), 7.88-7.97 (m, 2H), 7.56 (d, J=9.1 Hz, 1H), 4.14-4.36 (m, 4H), 1.30 (d, J=6.4 Hz, 6H).

Workup

  1. concentrationthen concentrated
  2. dissolutionThe residue was re-dissolved in 5 mL of a solution of dichloromethane/MeOH/ammonium hydroxide (60:10:1)
  3. stirringstirred at 25° C. for 3 h
  4. customevaporated to a light yellow solid
  5. dissolutiondissolved in dichloromethane (containing a few drops of MeOH)
  6. custompurified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% MeOH containing 10% ammonium hydroxide)/dichloromethane)
  7. additioncyclohexane added
  8. customthe solid was separated by filtration
  9. customdried

Sources & evidence

ORD record
ord-f873179176304d12b72ed76cc2b7c353
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

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