Hydrochloric Acid → (R)-3-cyclohexyl-2,3-dihydropyrrolo[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid

HRID 500445Notes

Reaction equation

HRID 500445 reaction equation
[CH:1]1([C@H:7]2[N:12]3[CH:13]=[C:14]([C:19](C(F)(F)F)=[O:20])[C:15]4[CH:16]=[CH:17][CH:18]=[C:10]([C:11]=43)[O:9][CH2:8]2)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.[OH-:25].[Na+].Cl>O1CCOCC1>[CH:1]1([C@H:7]2[N:12]3[CH:13]=[C:14]([C:19]([OH:25])=[O:20])[C:15]4[CH:16]=[CH:17][CH:18]=[C:10]([C:11]=43)[O:9][CH2:8]2)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6]1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 68676699(R)-3-cyclohexyl-6-trifluoromethylcarbonyl-2,3-dihydropyrrolo[1,2,3-de]-1,4-benzoxazine

Product 1

HCID 68675192(R)-3-cyclohexyl-2,3-dihydropyrrolo[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

To a solution of (R)-3-cyclohexyl-6-trifluoromethylcarbonyl-2,3-dihydropyrrolo[1,2,3-de]-1,4-benzoxazine (628 mg, 1.86 mmol) in 1,4-dioxane (20 ml) was added 4 N NaOH (5.0 ml). The mixture was refluxed for 42 h, then acidified to pH 1 using 5 N hydrochloric acid and partitioned between dichloromethane and water. The aqueous layer was extracted with dichloromethane, and combined organic layers were washed with brine, dried over Na2SO4 and concentrated to afford crude (R)-3-cyclohexyl-2,3-dihydropyrrolo[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (572 mg).

Workup

  1. temperatureThe mixture was refluxed for 42 h
  2. custompartitioned between dichloromethane and water
  3. extractionThe aqueous layer was extracted with dichloromethane
  4. washwere washed with brine
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-8e3136780764446797633eec2d8e8c69
Source dataset
uspto-grants-2010_08
Patent number
US07772227B2

Reaction notes

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