Ethyl Acetate → N-[6-[2-chloro-4-(phenylmethoxy)phenyl]-1H-indazol-3-yl]butanamide

HRID 497665Notes

Reaction equation

HRID 497665 reaction equation
[F-].C([N+](CCCC)(CCCC)CCCC)CCC.[Cl:19][C:20]1[CH:25]=[C:24]([O:26][CH2:27][C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[CH:23]=[CH:22][C:21]=1[C:34]1[CH:42]=[C:41]2[C:37]([C:38]([NH:51][C:52](=[O:56])[CH2:53][CH2:54][CH3:55])=[N:39][N:40]2COCC[Si](C)(C)C)=[CH:36][CH:35]=1.C(OCC)(=O)C>O1CCCC1>[Cl:19][C:20]1[CH:25]=[C:24]([O:26][CH2:27][C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[CH:23]=[CH:22][C:21]=1[C:34]1[CH:42]=[C:41]2[C:37]([C:38]([NH:51][C:52](=[O:56])[CH2:53][CH2:54][CH3:55])=[N:39][NH:40]2)=[CH:36][CH:35]=1

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 2724141Tetrabutylammonium FluorideHCID 22319610N-[6-[2-chloro-4-(phenylmethoxy)phenyl)-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide

Product 1

HCID 22319505N-[6-[2-chloro-4-(phenylmethoxy)phenyl]-1H-indazol-3-yl]butanamideYield 60.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

14.2 cm3 of tetrabutylammonium fluoride as a 1M solution in tetrahydrofuran are added to 1.3 g of N-[6-[2-chloro-4-(phenylmethoxy)phenyl]-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide, described previously, in 60 cm3 of tetrahydrofuran, and the mixture is refluxed for 18 hours; after cooling, 75 cm3 of ethyl acetate are added and the organic phase is washed successively with 50 cm3 of saturated sodium hydrogen carbonate solution and with 50 cm3 of saturated sodium chloride solution. The organic phase is separated out after settling of the phases has taken place, dried over magnesium sulphate, filtered and concentrated to dryness under reduced pressure (2 kPa; 50° C.) to give 1.8 g of crude product, which is purified by chromatography under an argon pressure of 50 kPa, on a column of silica gel (particle size 40-60 μm; diameter 3.5 cm), eluting with a cyclohexane/ethyl acetate mixture (60/40 by volume). The fractions containing the expected product are combined and evaporated under reduced pressure (2 kPa; 50° C.) and the residue is taken up in 10 cm3 of diisopropyl ether, filtered off, washed with 2×10 cm3 of diisopropyl ether and dried under reduced pressure (90 Pa; 45° C.) to give 600 mg of N-[6-[2-chloro-4-(phenylmethoxy)phenyl]-1H-indazol-3-yl]butanamide in the form of white crystals.

Workup

  1. temperaturethe mixture is refluxed for 18 hours
  2. temperatureafter cooling
  3. washthe organic phase is washed successively with 50 cm3 of saturated sodium hydrogen carbonate solution and with 50 cm3 of saturated sodium chloride solution
  4. customThe organic phase is separated out
  5. dry with materialdried over magnesium sulphate
  6. filtrationfiltered
  7. concentrationconcentrated to dryness under reduced pressure (2 kPa; 50° C.)
  8. customto give 1.8 g of crude product, which
  9. customis purified by chromatography under an argon pressure of 50 kPa
  10. washon a column of silica gel (particle size 40-60 μm; diameter 3.5 cm), eluting with a cyclohexane/ethyl acetate mixture (60/40 by volume)
  11. additionThe fractions containing the expected product
  12. customevaporated under reduced pressure (2 kPa; 50° C.)
  13. filtrationfiltered off
  14. washwashed with 2×10 cm3 of diisopropyl ether
  15. customdried under reduced pressure (90 Pa; 45° C.)

Sources & evidence

ORD record
ord-6e5625eb895e4e92bc1f6ebe7359588d
Source dataset
uspto-grants-2005_09
Patent number
US06949579B2

Reaction notes

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