Trifluoroacetic acid → 2-(6-trifluoromethyl-indazol-1-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butylamide

HRID 246487Notes

Reaction equation

HRID 246487 reaction equation
[C:1]([NH:5][C:6]([C:8]1[C:16]2[C:11](=[N:12][CH:13]=[C:14]([N:17]3[C:25]4[C:20](=[CH:21][CH:22]=[C:23]([C:26]([F:29])([F:28])[F:27])[CH:24]=4)[CH:19]=[N:18]3)[N:15]=2)[N:10](COCC[Si](C)(C)C)[CH:9]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].FC(F)(F)C(O)=O>ClCCl>[C:1]([NH:5][C:6]([C:8]1[C:16]2[C:11](=[N:12][CH:13]=[C:14]([N:17]3[C:25]4[C:20](=[CH:21][CH:22]=[C:23]([C:26]([F:27])([F:29])[F:28])[CH:24]=4)[CH:19]=[N:18]3)[N:15]=2)[NH:10][CH:9]=1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 71279727N-tert-Butyl-2-(6-(trifluoromethyl)-1H-indazol-1-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

Product 1

HCID 712799262-(6-trifluoromethyl-indazol-1-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butylamideYield 26.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of N-tert-butyl-2-(6-(trifluoromethyl)-1H-indazol-1-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (110 mg, 207 μmol) in dichloromethane (3 mL) was added trifluoroacetic acid (1 mL). After 15 h, the mixture was concentrated in vacuo then 25 mL of a Jan. 10, 1960 mixture of ammonium hydroxide/methanol/dichloromethane added. After 1 h the mixture was concentrated in vacuo. Purification by chromatography (silica, 24 g Analogix column, 0-4% over 15 min (methanol containing 10% ammonium hydroxide in dichloromethane) gave 2-(6-trifluoromethyl-indazol-1-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butylamide (21.8 mg, 26%). MS (M+H)+=403; 1H NMR (DMSO-d6) δ: 8.93 (s, 1H), 8.78 (s, 1H), 8.71 (d, J=0.8 Hz, 1H), 8.46 (s, 1H), 8.23 (d, J=8.5 Hz, 1H), 7.68 (dd, J=8.5, 1.3 Hz, 1H), 7.62 (s, 1H), 1.41 (s, 9H).

Workup

  1. concentrationthe mixture was concentrated in vacuo
  2. addition10, 1960 mixture of ammonium hydroxide/methanol/dichloromethane
  3. additionadded
  4. concentrationAfter 1 h the mixture was concentrated in vacuo
  5. customPurification by chromatography (silica, 24 g Analogix column, 0-4% over 15 min (methanol containing 10% ammonium hydroxide in dichloromethane)

Sources & evidence

ORD record
ord-21675fcbdc074bffb709464f4de229a2
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

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