Tetrabutylammonium Fluoride → N-[6-chloro-5-(4-pyridyl)-1H-indazol-3-yl]butanamide

HRID 497660Notes

Reaction equation

HRID 497660 reaction equation
[F-].C([N+](CCCC)(CCCC)CCCC)CCC.[Cl:19][C:20]1[CH:28]=[C:27]2[C:23]([C:24]([NH:37][C:38](=[O:42])[CH2:39][CH2:40][CH3:41])=[N:25][N:26]2COCC[Si](C)(C)C)=[CH:22][C:21]=1[C:43]1[CH:48]=[CH:47][N:46]=[CH:45][CH:44]=1>O1CCCC1.C(OCC)(=O)C.C(=O)([O-])O.[Na+]>[Cl:19][C:20]1[CH:28]=[C:27]2[C:23]([C:24]([NH:37][C:38](=[O:42])[CH2:39][CH2:40][CH3:41])=[N:25][NH:26]2)=[CH:22][C:21]=1[C:43]1[CH:44]=[CH:45][N:46]=[CH:47][CH:48]=1

Participants

6

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 22319682N-[6-chloro-5-(4-pyridyl)-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide

Product 1

HCID 22319680N-[6-chloro-5-(4-pyridyl)-1H-indazol-3-yl]butanamideYield 58.8%

Reagents, catalysts & solvents 3

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolventHCID 516892Sodium BicarbonateSolvent

Procedure

10.4 cm3 of tetrabutylammonium fluoride as a 1M solution in tetrahydrofuran are added to 770 mg of N-[6-chloro-5-(4-pyridyl)-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide, described previously, in 30 cm3 of tetrahydrofuran, and the mixture is refluxed for 18 hours. The reaction medium is diluted with 75 cm3 of ethyl acetate and 75 cm3 of saturated sodium hydrogen carbonate solution. The organic phase is separated out after settling of the phases has taken place, washed with 50 cm3 of saturated sodium chloride solution, dried over magnesium sulphate, filtered and concentrated to dryness under reduced pressure (2 kPa; 50° C.). The crude product obtained is purified by chromatography under an argon pressure of 50 kPa, on a column of silica gel (particle size 40-60 μm; diameter 2.5 cm), eluting with ethyl acetate. The fractions containing the expected product are combined and evaporated under reduced pressure (2 kPa; 50° C.); the residue is taken up in 20 cm3 of ethyl acetate, filtered off, washed with 5 cm3 of ethyl acetate and 20 cm3 diethyl ether, and dried under reduced pressure (90 Pa; 45° C.) to give 320 mg of N-[6-chloro-5-(4-pyridyl)-1H-indazol-3-yl]butanamide in the form of white crystals melting above 260° C.

Workup

  1. temperaturethe mixture is refluxed for 18 hours
  2. customThe organic phase is separated out
  3. washwashed with 50 cm3 of saturated sodium chloride solution
  4. dry with materialdried over magnesium sulphate
  5. filtrationfiltered
  6. concentrationconcentrated to dryness under reduced pressure (2 kPa; 50° C.)
  7. customThe crude product obtained
  8. customis purified by chromatography under an argon pressure of 50 kPa
  9. washon a column of silica gel (particle size 40-60 μm; diameter 2.5 cm), eluting with ethyl acetate
  10. additionThe fractions containing the expected product
  11. customevaporated under reduced pressure (2 kPa; 50° C.)
  12. filtrationfiltered off
  13. washwashed with 5 cm3 of ethyl acetate and 20 cm3 diethyl ether
  14. customdried under reduced pressure (90 Pa; 45° C.)

Sources & evidence

ORD record
ord-ae7e4150d8204836a4ce8baa72b9bfa6
Source dataset
uspto-grants-2005_09
Patent number
US06949579B2

Reaction notes

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