Potassium hydroxide monohydrate → HCID 22708342, compound

HRID 353247

Reaction equation

HRID 353247 reaction equation
[OH:1][C:2]1([C:18]([O:20]C)=[O:19])[C:11]2[C:6](=[C:7]([O:13][C:14]([F:17])([F:16])[F:15])[CH:8]=[C:9]([Cl:12])[CH:10]=2)[O:5][CH2:4][CH2:3]1.[OH-].[K+].O>C(O)(C)C>[OH:1][C:2]1([C:18]([OH:20])=[O:19])[C:11]2[C:6](=[C:7]([O:13][C:14]([F:17])([F:15])[F:16])[CH:8]=[C:9]([Cl:12])[CH:10]=2)[O:5][CH2:4][CH2:3]1

Participants

4

Reactant 2

HCID 23719240Potassium hydroxide monohydrateHCID 86615847HCID 86615847, compound

Product 1

HCID 22708342HCID 22708342, compound

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

A solution of 4-hydroxy-6-chloro-8-trifluoromethoxychroman-4-yl carboxylic acid, methyl ester in iso-propanol (50 mL) was added to KOH/H2O (20%, 60 mL) and the mixture was refluxed overnight. The resultant solution was partially concentrated, and the remainder was acidified with H2SO4 (10%). The very turbid mixture was extracted with ether (3×), and the combined organic phase was dried (Na2SO4) and concentrated. The crude product was purified via prep-HPLC (CH3CN:0.1M ammonium acetate (30:60)). The fractions of interest were partly concentrated and extracted with ether. The combined organic layers were washed with water, dried (Na2SO4), and concentrated, yielding 0.24 g (10% over steps (vi)-(ix)).

Workup

  1. temperaturethe mixture was refluxed overnight
  2. concentrationThe resultant solution was partially concentrated
  3. extractionThe very turbid mixture was extracted with ether (3×)
  4. dry with materialthe combined organic phase was dried (Na2SO4)
  5. concentrationconcentrated
  6. customThe crude product was purified via prep-HPLC (CH3CN:0.1M ammonium acetate (30:60))
  7. concentrationThe fractions of interest were partly concentrated
  8. extractionextracted with ether
  9. washThe combined organic layers were washed with water
  10. dry with materialdried (Na2SO4)
  11. concentrationconcentrated
  12. customyielding 0.24 g (10% over steps (vi)-(ix))

Sources & evidence

ORD record
ord-c0de8a02ad934412b2796506b0bef1b1
Source dataset
uspto-grants-2004_06
Patent number
US06750243B1

Linked notes

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