Reaktion #1481

Reaktionsgleichung

ethyl 4-[(5,6-dihydro-5,5-dimethyl-8-trifluoromethylsulfonyloxy-naphthalen-2-yl)azo]benzoate

thiophene

t-BuLi

→

title compound

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

Lösungsmittel

THF

THF

NH4Cl

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGstirred for 1 h
2. 2
   TemperaturThe resulting mixture was heated at 50° C. for 2.5 h
3. 3
   Extraktionextracted with ethyl acetate
4. 4
   TrocknenThe combined organic layer was dried over Na2SO4
5. 5
   Einengenconcentrated to an oil
6. 6
   SonstigeThe crude product was purified by flash chromatography (silica, ethyl acetate:hexane 5:95)

Vorschrift

To a cold solution (-78° C.) of thiophene (0.07 ml, 0.75 mmol) in 1.5 ml of THF 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 1 h 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 D11, 150 mg, 0.30 mmol) and tetrakis(triphenylphosphine)palladium(0) (10.6 mg) in 2.5 ml of 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.

Quelle