Reacción #9631

Ecuación de reacción

methyl 4-(2-chloro-2-oxoethyl)tetrahydro-2H-pyran-4-carboxylate

bromobenzene

aluminum chloride

→

methyl 4-[2-(4-bromo-phenyl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate

Rendimiento 55.0%

Disolventes

dichloromethane

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe ice-water bath was removed
2. 2
   TemperaturaThe mixture was then cooled at 0° C.
3. 3
   Otroquenched by the addition of 1 N HCl solution and water
4. 4
   ExtracciónThe mixture was extracted with dichloromethane
5. 5
   Secadothe combined organic phases were dried over sodium sulfate
6. 6
   OtroThe crude material was then purified by flash chromatography (Biotage Flash 40 M, 2:1 hexane/ethyl acetate

Procedimiento

To a solution of methyl 4-(2-chloro-2-oxoethyl)tetrahydro-2H-pyran-4-carboxylate (1.06 g, 4.8 mmol) and bromobenzene (1.13 g, 7.21 mmol) in dichloromethane (20 mL) at 0° C. was added aluminum chloride (1.92 g, 14.4 mmol). The ice-water bath was removed and the reaction mixture was stirred at rt for 16 h. The mixture was then cooled at 0° C. and quenched by the addition of 1 N HCl solution and water. The mixture was extracted with dichloromethane, and the combined organic phases were dried over sodium sulfate. The crude material was then purified by flash chromatography (Biotage Flash 40 M, 2:1 hexane/ethyl acetate, to afford methyl 4-[2-(4-bromo-phenyl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate (900 mg, 55%). LC-MS ret. time 2.76 min; m/z 342.9 (MH+); 1H NMR (300 MHz, CDCl3) δ 1.58–1.69 (m, 2H), 2.12–2.18 (m, 2H), 3.28 (s, 2H), 3.64 (s, 3H), 3.69–3.77 (m, 4H), 7.59 (d, 2H), 7.77 (d, 2H).

Fuente