Thiophene → Ethyl 4-[(5,5-dimethyl-8-(2-thienyl)-5,6-dihydronaphthalen-2-yl)azo]benzoate

HRID 2394195Notes

Reaction equation

HRID 2394195 reaction equation
[S:1]1[CH:5]=[CH:4][CH:3]=[CH:2]1.[Li]C(C)(C)C.[CH3:11][C:12]1([CH3:43])[CH2:21][CH:20]=[C:19](OS(C(F)(F)F)(=O)=O)[C:18]2[CH:17]=[C:16]([N:30]=[N:31][C:32]3[CH:42]=[CH:41][C:35]([C:36]([O:38][CH2:39][CH3:40])=[O:37])=[CH:34][CH:33]=3)[CH:15]=[CH:14][C:13]1=2>C1COCC1.[NH4+].[Cl-].[Cl-].[Cl-].[Zn+2].C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:43][C:12]1([CH3:11])[CH2:21][CH:20]=[C:19]([C:2]2[S:1][CH:5]=[CH:4][CH:3]=2)[C:18]2[CH:17]=[C:16]([N:30]=[N:31][C:32]3[CH:33]=[CH:34][C:35]([C:36]([O:38][CH2:39][CH3:40])=[O:37])=[CH:41][CH:42]=3)[CH:15]=[CH:14][C:13]1=2

Participants

8

Reactant 3

HCID 8030ThiopheneHCID 22323756Ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-trifluoromethylsulfonyloxy-naphthalen-2-yl)azo]benzoate2×HCID 178418306HCID 178418306, compound

Product 1

HCID 13006282Ethyl 4-[(5,5-dimethyl-8-(2-thienyl)-5,6-dihydronaphthalen-2-yl)azo]benzoate

Reagents, catalysts & solvents 4

HCID 3007855ZincchlorideCatalystHCID 178418397HCID 178418397, compoundCatalystHCID 8028TetrahydrofuranSolvent2×HCID 25517Ammonium ChlorideSolvent

Procedure

To a cold solution (-78° C.) of thiophene (0.07 ml, 0.75 mmol) in 1.5 ml of TIF was added t-BuLi (0.457 ml, 0.75 mmol, 1.7M in pentane) and stirred for 2 h. To this solution, ZnCl2 (168 mg, 1.2 mmol) in 1.5 ml of THF was added. The resulting solution was warmed to room temperature, stirred for lh and was added (via cannula) to a solution of ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-trifluoromethylsulfonyloxy-naphthalen-2-yl)azo]benzoate (Compound D1, 150 mg, 0.30 mmol) and tetrakis(triphenylphosphine)palladium(0) (10.6 mg) in 2.5 ml of 11 THF. The resulting mixture was heated at 50° C. for 2.5 h. The reaction was diluted with sat. aqueous NH4Cl and extracted with ethyl acetate. The combined organic layer was dried over Na2SO4 and concentrated to an oil. The crude product was purified by flash chromatography (silica, ethyl acetate: hexane 5: 95) to afford the title compound as a red foam.

Workup

  1. stirringstirred for lh
  2. temperatureThe resulting mixture was heated at 50° C. for 2.5 h
  3. extractionextracted with ethyl acetate
  4. dry with materialThe combined organic layer was dried over Na2SO4
  5. concentrationconcentrated to an oil
  6. customThe crude product was purified by flash chromatography (silica, ethyl acetate: hexane 5: 95)

Sources & evidence

ORD record
ord-8a1bf0177e01465a89983cdf9b37234f
Source dataset
uspto-grants-1998_09
Patent number
US05808124

Reaction notes

Loading…