Potassium Carbonate → Carbamic acid, [(1R,4R)-4-hydroxy-2-cyclohexen-1-yl]-, 1,1-dimethylethyl ester, rel-

HRID 899631Notes

Reaction equation

HRID 899631 reaction equation
C([O:4][C@H:5]1[CH2:10][CH2:9][C@H:8]([NH:11][C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH:7]=[CH:6]1)(=O)C.C([O-])([O-])=O.[K+].[K+]>CO>[OH:4][C@H:5]1[CH2:10][CH2:9][C@H:8]([NH:11][C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH:7]=[CH:6]1

Participants

4

Reactant 2

HCID 11430Potassium CarbonateHCID 69178218HCID 69178218, compound

Product 1

HCID 69157188Carbamic acid, [(1R,4R)-4-hydroxy-2-cyclohexen-1-yl]-, 1,1-dimethylethyl ester, rel-Yield 60.3%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of trans-1-acetoxy-4-(tert-butoxycarbonylamino)-2-cyclohexene (6.70 g, 26.3 mmol) in methanol (130 mL) was added solid K2CO3 (7.50 g, 54.4 mmol) and the mixture was stirred at room temperature for 1 hour. The reaction mixture was concentrated and the residue was dissolved in CH2Cl2 (250 mL) and saturated aqueous NaHCO3 (100 mL). The phases were separated and the aqueous phase was extracted with CH2Cl2 (3×50 mL). The combined organic extracts were dried (Na2SO4) and concentrated. Purification of the crude material by column chromatography on silica gel (20:1 CH2Cl2—CH3OH) provided 3.38 g (60%) of trans-1-hydroxy-4-(tert-butoxycarbonylamino)-2-cyclohexene as a white solid. 1H NMR (CDCl3) δ 1.44 (s, 9H), 1.52-1.57 (m, 1H), 2.05-2.14 (m, 3H), 4.20-4.26 (br s, 2H), 4.45 (br s, 1H), 4.47-4.60 (m, 1H), 5.70 (d, 1H, J=10.2 Hz), 5.81 (d, 1H, J=10.2 Hz);

Workup

  1. concentrationThe reaction mixture was concentrated
  2. dissolutionthe residue was dissolved in CH2Cl2 (250 mL)
  3. customThe phases were separated
  4. extractionthe aqueous phase was extracted with CH2Cl2 (3×50 mL)
  5. dry with materialThe combined organic extracts were dried (Na2SO4)
  6. concentrationconcentrated
  7. customPurification of the crude material by column chromatography on silica gel (20:1 CH2Cl2—CH3OH)

Sources & evidence

ORD record
ord-ba840cd3619440afa5e4cdd502631dd5
Source dataset
uspto-grants-2008_04
Patent number
US07354932B2

Reaction notes

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