Reacción #2329956

Ecuación de reacción

1-chloro-6-iodohexane

thiophene

n-butyllithium

→

oil

Rendimiento 92.0%

2-(6-Chlorohexyl)thiophene

Rendimiento 92.0%

Disolventes

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONAfter complete addition
2. 2
   OtroThe reaction is quenched with sat. aq. ammonium chloride
3. 3
   Extracciónthe reaction mixture is extracted with ethyl acetate (3×70 ml)
4. 4
   LavadoThe combined organic extracts are washed with water, brine
5. 5
   Secadodried over magnesium sulphate
6. 6
   OtroThe solvent is removed under reduced pressure
7. 7
   Otrothe residue is chromatographed (silica gel, petroleum ether)

Procedimiento

To a stirred solution of thiophene (5.0 g, 59.5 mmol) in dry THF (50 ml) is added n-butyllithium (2.5 M in hexanes, 20.0 ml, 50.0 mmol) dropwise at −78° C. under nitrogen. After complete addition, the mixture is allowed to warm to room temperature, with stirring, over 2 h, followed by the addition of 1-chloro-6-iodohexane (12.3 g, 50.0 mmol). The resultant mixture is stirred overnight at room temperature. The reaction is quenched with sat. aq. ammonium chloride, and the reaction mixture is extracted with ethyl acetate (3×70 ml). The combined organic extracts are washed with water, brine, and dried over magnesium sulphate. The solvent is removed under reduced pressure and the residue is chromatographed (silica gel, petroleum ether), to give a pale yellow oil (9.3 g, 92%). 1H NMR (300 MHz, CDCl3): δ (ppm) 7.06 (dd, J=5.1 Hz, 1.2 Hz, 1H, Ar—H), 6.87 (dd, J=5.1 Hz, 3.4 Hz, 1H, Ar—H), 6.75 (m, 1H, Ar—H), 3.48 (t, J=6.6 Hz, 2H, ClCH2), 2.80 (t, J=7.4 Hz 2H, ArCH2), 1.61-1.78 (m, 4H, CH2), 1.29-1.50 (m, 4H, CH2); 13C NMR (75 MHz, CDCl3): δ (ppm) 145.5 (quat.), 126.7 (CH), 124.1 (CH), 122.9 (CH), 45.1 (CH2), 32.6 (CH2), 31.7 (CH2), 29.9 (CH2), 28.4 (CH2) 26.7 (CH2); MS (m/e) 204 (M+, 9%), 202 (M+, 3%), 97 (100).

Fuente