Methanol → 5,6-Dibromo-4,7-dimethyl-1,4-epoxy-1,4-dihydronaphthalene

HRID 28789

Reaction equation

HRID 28789 reaction equation
Br[C:2]1[C:7]([CH3:8])=[C:6]([Br:9])[C:5]([Br:10])=[C:4]([CH3:11])[C:3]=1Br.[O:13]1C=[CH:16][CH:15]=[CH:14]1.[Li][CH2:19]CCC.CO>C1(C)C=CC=CC=1.O>[Br:10][C:5]1[C:6]([Br:9])=[C:7]([CH3:8])[CH:2]=[C:3]2[C:4]=1[C:11]1([CH3:19])[O:13][CH:14]2[CH:15]=[CH:16]1

Participants

7

Reactant 4

HCID 887MethanolHCID 8029FuranHCID 31952Benzene, 1,2,4,5-tetrabromo-3,6-dimethyl-HCID 178418339Butyllithium

Product 1

HCID 226789125,6-Dibromo-4,7-dimethyl-1,4-epoxy-1,4-dihydronaphthaleneYield 50%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
-78 °C

Procedure

To tetrabromo para-xylene (2.1 g, 5.0 mmol) and furan (4 g, 58.8 mmol) in PhMe (55 mL) at −78° C. was added BuLi (2.2 mL, 2.5M in hexanes, 5.5 mmol) dropwise. The reaction was stirred for two hours at −78° C. and the allowed to warm to rt. After 3 hours, MeOH (2 mL) was added and the reaction mixture was poured into water. The organic layer was separated and the aqueous layer was extracted three times with Et2O. The combined organic layers were washed with brine, dried over MgSO4, and concentrated. Flash chromatography on silca gel gave 26 (185 mg, 50%) as a white solid. The spectral data correlates well with the literature values. 22

Workup

  1. temperatureto warm to rt
  2. waitAfter 3 hours
  3. customThe organic layer was separated
  4. extractionthe aqueous layer was extracted three times with Et2O
  5. washThe combined organic layers were washed with brine
  6. dry with materialdried over MgSO4
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-d83172b32ece455e8c15e3a664faf33b
Source dataset
uspto-grants-2008_09
Patent number
US07420003B2

Linked notes

Loading…