Tetrabutylammonium Fluoride → HCID 178489413, compound

HRID 2388933Notes

Reaction equation

HRID 2388933 reaction equation
C([O:3][C:4](=[O:36])[C:5]1[CH:10]=[C:9]([C:11]2[CH:12]=[C:13]3[C:19]([C:20]4[CH:25]=[CH:24][CH:23]=[CH:22][C:21]=4[O:26][CH3:27])=[N:18][N:17](COCC[Si](C)(C)C)[C:14]3=[N:15][CH:16]=2)[CH:8]=[N:7][CH:6]=1)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>C1COCC1>[CH3:27][O:26][C:21]1[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=1[C:19]1[C:13]2[C:14](=[N:15][CH:16]=[C:11]([C:9]3[CH:8]=[N:7][CH:6]=[C:5]([CH:10]=3)[C:4]([OH:36])=[O:3])[CH:12]=2)[NH:17][N:18]=1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 598360525-[3-(2-methoxy-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-nicotinic acid ethyl ester

Product 1

HCID 178489413HCID 178489413, compoundYield 192.7%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
70 °C

Procedure

To a solution of 5-[3-(2-methoxy-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-nicotinic acid ethyl ester (494 mg, 0.98 mmol) in THF (20 mL) was added tetra-n-butylammonium fluoride in THF (1M, 10 ml, 10 mmol) and activated 4 Å molecular sieves. The resulting mixture was stirred at 70° C. for 7 h. The sieves were filtered off, washing with ethyl acetate and the resulting filtrate concentrated. The residue was distributed between dichloromethane and water. The aqueous phase was extracted three times with dichloromethane and the organic phases combined, dried over sodium sulfate, filtered and concentrated to afford of 5-[3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-nicotinic acid (654 mg, 62% purity, 405 mg, 119% yield) as a brown solid. 1H-NMR (500 MHz, d6-DMSO) δ 13.98 (s, 1H), 8.99 (d, 1H), 8.95 (s, 1H), 8.88 (d, 1H), 8.43 (t, 1H), 8.40 (d, 1H), 7.67 (dd, 1H), 7.47 (ddd, 1H), 7.23 (d, 1H), 7.10 (dt, 1H), 3.86 (s, 3H). MS: m/z 345 (96%) [M−H−].

Workup

  1. filtrationThe sieves were filtered off
  2. washwashing with ethyl acetate
  3. concentrationthe resulting filtrate concentrated
  4. extractionThe aqueous phase was extracted three times with dichloromethane
  5. dry with materialdried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-2cb8123aa6ed480283ebd7fa13860fed
Source dataset
uspto-grants-2012_09
Patent number
US08268994B2

Reaction notes

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