Reacción #1481

Ecuación de reacción

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

Disolventes

THF

THF

NH4Cl

THF

Condiciones de reacción

Tratamiento posterior

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

Procedimiento

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.

Fuente