تفاعل #9631

معادلة التفاعل

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

المردود 55.0%

المذيبات

dichloromethane

ظروف التفاعل

المعالجة

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

الإجراء التجريبي

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).

المصدر