Tetrabutylammonium Fluoride → 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide

HRID 246230Notes

Reaction equation

HRID 246230 reaction equation
[CH2:1]([N:8]1[CH2:12][CH2:11][C@@H:10]([NH:13][C:14]([C:16]2[C:24]3[C:19](=[N:20][CH:21]=[C:22]([C:25]4[C:33]5[C:28](=[CH:29][C:30]([F:34])=[CH:31][CH:32]=5)[N:27]([CH3:35])[N:26]=4)[N:23]=3)[N:18](COCC[Si](C)(C)C)[CH:17]=2)=[O:15])[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[CH2:1]([N:8]1[CH2:12][CH2:11][C@@H:10]([NH:13][C:14]([C:16]2[C:24]3[C:19](=[N:20][CH:21]=[C:22]([C:25]4[C:33]5[C:28](=[CH:29][C:30]([F:34])=[CH:31][CH:32]=5)[N:27]([CH3:35])[N:26]=4)[N:23]=3)[NH:18][CH:17]=2)=[O:15])[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 712860862-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide

Product 1

HCID 712859212-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amideYield 29%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a 20 ml vial containing 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide (51 mg, 0.085 mmol) dissolved in THF (1 ml) was added TBAF (1.0 M in THF, 1.0 ml, 1.0 mmol). The vial was backfilled with nitrogen then sealed and placed in heat block at 80° C. for 3 h. The reaction was cooled to room temperature, quenched with acetone (2 ml) and sat'd NaHCO3 (20 ml). The mixture was stirred for 1 h then extracted with EtOAc and the organics washed with brine. The aqueous was again extracted with EtOAc and the organics washed with brine. The organics were combined, dried over MgSO4, filtered and concentrated. The crude was dissolved in MeOH and EtOAc, supported on Celite, and purified by flash chromatography (4 g silicycle) with 0% to 10% MeOH in dichloromethane to 10% MeOH in EtOAc. The appropriate fractions were combined and concentrated. The solid was triturated with dichloromethane, Et2O, and hexanes to isolate 11 mg (29%) of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-benzyl-pyrrolidin-3-yl)-amide as a white solid. LC-MS (M+H)+=470; 1H NMR (300 MHz, DMSO-d6) δ: 12.87 (br. s., 1H), 9.10 (s, 1H), 8.34-8.54 (m, 3H), 7.68 (dd, J=9.8, 1.8 Hz, 1H), 7.11-7.26 (m, 5H), 6.97 (td, J=9.1, 1.9 Hz, 1H), 4.60 (br. s., 1H), 4.16 (s, 3H), 3.61 (s, 2H), 2.82-2.97 (m, 1H), 2.58-2.75 (m, 2H), 2.29-2.44 (m, 2H), 1.75 (br. s., 1H).

Workup

  1. customthen sealed
  2. customquenched with acetone (2 ml) and sat'd NaHCO3 (20 ml)
  3. extractionthen extracted with EtOAc
  4. washthe organics washed with brine
  5. extractionThe aqueous was again extracted with EtOAc
  6. washthe organics washed with brine
  7. dry with materialdried over MgSO4
  8. filtrationfiltered
  9. concentrationconcentrated
  10. dissolutionThe crude was dissolved in MeOH
  11. custompurified by flash chromatography (4 g silicycle) with 0% to 10% MeOH in dichloromethane to 10% MeOH in EtOAc
  12. concentrationconcentrated
  13. customThe solid was triturated with dichloromethane, Et2O, and hexanes

Sources & evidence

ORD record
ord-754b7593163e4e74801e3cce640fe35d
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

Loading…