Hydrochloric Acid → HCID 57969215, compound

HRID 1664321Notes

Reaction equation

HRID 1664321 reaction equation
[C:1]([C:3]1[CH:19]=[CH:18][C:6]([O:7][C:8]2[CH:9]=[CH:10][C:11]3[B:15]([OH:16])[O:14][CH2:13][C:12]=3[CH:17]=2)=[C:5]([OH:20])[CH:4]=1)#N.[OH-:21].[Na+].Cl.C[OH:25]>O1CCOCC1>[C:1]([C:3]1[CH:19]=[CH:18][C:6]([O:7][C:8]2[CH:9]=[CH:10][C:11]3[B:15]([OH:16])[O:14][CH2:13][C:12]=3[CH:17]=2)=[C:5]([OH:20])[CH:4]=1)([OH:25])=[O:21]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 887MethanolHCID 14798Sodium HydroxideHCID 67439736HCID 67439736, compound

Product 1

HCID 57969215HCID 57969215, compoundYield 30%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

A mixture of 5-(4-cyano-2-hydroxyphenoxy)-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (D14) (4.00 g, 15.0 mmol) and 6 M NaOH (30 mL) in methanol (60 mL) and 1,4-dioxane (60 mL) was refluxed for 5 days. The mixture was cooled on an ice bath and acidified with 6 M HCl, then extracted with ethyl acetate. The organic layer was washed with brine and dried on anhydrous sodium sulfate. The solvent was removed under reduced pressure and the residue was recrystallized from ethyl acetate to give 5-(4-carboxy-2-hydroxyphenoxy)-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (1.29 g, 30%). Silica gel column (3:7 to 2:8 hexane/ethyl acetate) of the filtrate followed by trituration with ethyl acetate gave another 1.00 g (23%).

Workup

  1. temperaturewas refluxed for 5 days
  2. temperatureThe mixture was cooled on an ice bath
  3. extractionextracted with ethyl acetate
  4. washThe organic layer was washed with brine
  5. dry with materialdried on anhydrous sodium sulfate
  6. customThe solvent was removed under reduced pressure
  7. customthe residue was recrystallized from ethyl acetate

Sources & evidence

ORD record
ord-ad0e1e7ebe2b47feae9b9b2721688a9f
Source dataset
uspto-grants-2011_10
Patent number
US08039450B2

Reaction notes

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