Tetrabutylammonium Fluoride → HCID 136016222, compound

HRID 2078719Notes

Reaction equation

HRID 2078719 reaction equation
[C:1]([O:5][C:6]([N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([O:17][Si](C(C)(C)C)(C)C)[CH:15]=2)[CH:10]=[C:9]1[C:25]1[C:26]2[S:39][C:38]([C:40]3[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=3)=[CH:37][C:27]=2[N:28]([C:30]([O:32][C:33]([CH3:36])([CH3:35])[CH3:34])=[O:31])[N:29]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[F-].C([N+](CCCC)(CCCC)CCCC)CCC>O1CCCC1>[C:1]([O:5][C:6]([N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([OH:17])[CH:15]=2)[CH:10]=[C:9]1[C:25]1[C:26]2[S:39][C:38]([C:40]3[CH:41]=[CH:42][CH:43]=[CH:44][CH:45]=3)=[CH:37][C:27]=2[N:28]([C:30]([O:32][C:33]([CH3:36])([CH3:35])[CH3:34])=[O:31])[N:29]=1)=[O:7])([CH3:2])([CH3:3])[CH3:4]

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 57637385HCID 57637385, compound2×

Product 1

HCID 136016222HCID 136016222, compoundYield 99%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of 2-(1-tert-butoxycarbonyl-5-phenyl-1H-thieno[3,2-c]pyrazol-3-yl)-6-(tert-butyl-dimethyl-silanyloxy)-indole-1-carboxylic acid tert-butyl ester [2.44 g, 3.78 mmol, Intermediate (48)] in tetrahydrofuran (25 mL) at 0° C. was added tetrabutylammonium fluoride (4.20 mL of a 1M THF solution, 4.20 mmol) in one portion with stirring. After 40 minutes, the reaction was partitioned between ethyl acetate (75 mL) and 10% aqueous ammonium chloride (50 mL) and the layers separated. The organics were washed with water (50 mL) and brine (50 mL) successively, dried over magnesium sulfate, and the solvent removed under reduced pressure to give an amber foam. The crude product was chromatographed on silica, eluting with 10% ethyl acetate/dichloromethane, to yield 2-(1-tert-butoxycarbonyl-5-phenyl-1H-thieno[3,2-c]pyrazol-3-yl)-6-hydroxy-indole-1-carboxylic acid tert-butyl ester [1.99 g, 99%, Intermediate (49)] as a tan foam. TLC Rf 0.31 (silica, 10% ethyl acetate/dichloromethane); LC/MS: 532.2 (M+H), RT=4.31 minutes; 1H NMR [300 Mhz, (CD3)2SO]: δ 9.73 (s, 1H), 7.84-7.81 (m, 2H), 7.76 (s, 1H), 7.61 (d, J=2 Hz, 1H), 7.56-7.44 (m, 4H), 7.07 (s, 1H), 6.84 (dd, J=2, 8 Hz, 1H), 1.71 (s, 9H), 1.40 (s, 9H).

Workup

  1. customthe reaction was partitioned between ethyl acetate (75 mL) and 10% aqueous ammonium chloride (50 mL)
  2. customthe layers separated
  3. washThe organics were washed with water (50 mL) and brine (50 mL) successively
  4. dry with materialdried over magnesium sulfate
  5. customthe solvent removed under reduced pressure
  6. customto give an amber foam
  7. customThe crude product was chromatographed on silica
  8. washeluting with 10% ethyl acetate/dichloromethane

Sources & evidence

ORD record
ord-855ae489a02e471ca427756915c1fe58
Source dataset
uspto-grants-2011_04
Patent number
US07928231B2

Reaction notes

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