Potassium Carbonate → 4,5-Dihydrobenzo[b]thieno[2,3-d]oxepine

HRID 2078838Notes

Reaction equation

HRID 2078838 reaction equation
I[C:2]1[CH:15]=[CH:14][CH:13]=[CH:12][C:3]=1[O:4][CH2:5][CH2:6][C:7]1[CH:11]=[CH:10][S:9][CH:8]=1.C(=O)([O-])[O-].[K+].[K+]>[Cl-].C([N+](CC)(CC)CC)C.CN(C=O)C.ClCCl.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[S:9]1[C:8]2[C:2]3[CH:15]=[CH:14][CH:13]=[CH:12][C:3]=3[O:4][CH2:5][CH2:6][C:7]=2[CH:11]=[CH:10]1

Participants

7

Reactant 2

HCID 11430Potassium CarbonateHCID 640847853-(2-(2-Iodophenoxy)ethyl)thiophene

Product 1

HCID 579001554,5-Dihydrobenzo[b]thieno[2,3-d]oxepine

Reagents, catalysts & solvents 4

HCID 5946Tetraethylammonium ChlorideCatalystHCID 167845palladium(II) acetateCatalystHCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 2-iodophenol (6.7 g, 30.6 mmol), 2-(3-thienyl)ethanol (3.57 g, 27.8 mol) and triphenylphosphene (8.00 g, 30.6 mmol) in THF, was slowly added a solution of DEAD (4.8 ml, 30.6 mmol). Reaction mixture was stirred at room temperature for 3 hours. Purification on silica gave 3-[2-(2-iodo-phenoxy)-ethyl]-thiophene. A mixture of 3-[2-(2-iodo-phenoxy)-ethyl]-thiophene (1.55 g, 4.69 mmol), palladium(II) acetate (105 mg, 0.47 mmol), potassium carbonate (3.2 g, 23.45 mmol), triphenylphosphene (246 mg, 0.94 mmol) and tetraethylammonium chloride (1.3 g, 4.69 mmol) in DMF was microwaved at 100° C. for 1 hour. The reaction was diluted with dichloromethane and filtered through celite. The filtrate was washed with water, dried (MgSO4), and concentrated in-vacuo. Purification on silica gave 4,5-dihydrobenzo[b]thieno[2,3-d]oxepine.

Workup

  1. customwas microwaved at 100° C. for 1 hour
  2. filtrationfiltered through celite
  3. washThe filtrate was washed with water
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in-vacuo
  6. customPurification on silica

Sources & evidence

ORD record
ord-0f1ca9afb08345f588040f9f2b70a645
Source dataset
uspto-grants-2011_04
Patent number
US07928248B2

Reaction notes

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