Potassium Carbonate → ethyl 2-(4-amino-5-fluoro-2-(4-methyl-5-oxo-4,5-dihydro-1H-tetrazol-1-yl)phenoxy)-2-methylpropanoate

HRID 633392Notes

Reaction equation

HRID 633392 reaction equation
[NH2:1][C:2]1[C:3]([F:16])=[CH:4][C:5]([OH:15])=[C:6]([N:8]2[C:12](=[O:13])[N:11]([CH3:14])[N:10]=[N:9]2)[CH:7]=1.Br[C:18]([CH3:25])([CH3:24])[C:19]([O:21][CH2:22][CH3:23])=[O:20].C([O-])([O-])=O.[K+].[K+]>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.CC(C)=O>[NH2:1][C:2]1[C:3]([F:16])=[CH:4][C:5]([O:15][C:18]([CH3:25])([CH3:24])[C:19]([O:21][CH2:22][CH3:23])=[O:20])=[C:6]([N:8]2[C:12](=[O:13])[N:11]([CH3:14])[N:10]=[N:9]2)[CH:7]=1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 11745Propanoic acid, 2-bromo-2-methyl-, ethyl esterHCID 1363444071-(5-amino-4-fluoro-2-hydroxyphenyl)-4-methyl-1H-tetrazol-5(4H)-one

Product 1

HCID 86704492ethyl 2-(4-amino-5-fluoro-2-(4-methyl-5-oxo-4,5-dihydro-1H-tetrazol-1-yl)phenoxy)-2-methylpropanoateYield 74.3%

Reagents, catalysts & solvents 2

HCID 74236Tetrabutylammonium BromideCatalystHCID 180AcetoneSolvent

Procedure

A mixture of 1-(5-amino-4-fluoro-2-hydroxyphenyl)-4-methyl-1H-tetrazol-5(4H)-one (5.00 g, 22.2 mmol, 1.00 equiv), ethyl 2-bromo-2-methylpropanoate (6.50 g, 4.94 mL, 33.3 mmol, 1.50 equiv), K2CO3 (6.15 g, 44.4 mmol, 2.00 equiv), and tetra-n-butylammonium bromide (716 mg, 2.22 mmol, 0.10 equiv) in acetone (220 mL) was heated at reflux overnight. After cooling to RT, the reaction mixture was concentrated to dryness. The crude product was taken in excess water and EtOAc. The layers were separated, and the aqueous layer was extracted with EtOAc 2×. The organic layer was dried over Na2SO4, filtered, and concentrated to dryness. The crude product was absorbed onto silica gel and purified by flash chromatography and eluted with DCM:MeOH=100:0 to 98% MeOH using 1% MeOH increments to provide ethyl 2-(4-amino-5-fluoro-2-(4-methyl-5-oxo-4,5-dihydro-1H-tetrazol-1-yl)phenoxy)-2-methylpropanoate (5.60 g, 74%) as a clear brown oil.

Workup

  1. temperaturewas heated
  2. temperatureat reflux overnight
  3. concentrationthe reaction mixture was concentrated to dryness
  4. customThe layers were separated
  5. extractionthe aqueous layer was extracted with EtOAc 2×
  6. dry with materialThe organic layer was dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated to dryness
  9. customThe crude product was absorbed onto silica gel
  10. custompurified by flash chromatography
  11. washeluted with DCM

Sources & evidence

ORD record
ord-aaec0d46d603409b84fa3e927c5da9c8
Source dataset
uspto-grants-2016_04
Patent number
US09321763B2

Reaction notes

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