反応 #9632

反応方程式

Methyl 4-[2-(4-bromophenyl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate

4-nitrophenyl boronic acid

sodium carbonate

dichloromethane

→

methyl 4-[2-(4′-nitro-1,1′-biphenyl-4-yl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate

収率 79.3%

溶媒

Water

dioxane

Toluene

反応条件

後処理

1. 1
   その他the resulting solution was degassed for 30 minutes by a flow of argon
2. 2
   温度was cooled to rt
3. 3
   抽出the aqueous layer was extracted twice with ethyl acetate
4. 4
   乾燥The combined organic phases were then dried over anhydrous sodium sulfate
5. 5
   濃縮concentrated under reduced pressure
6. 6
   その他The resulting residue was purified by flash chromatography (Biotage Flash 40)

実験手順

Methyl 4-[2-(4-bromophenyl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate (820 mg, 2.40 mmol) and 4-nitrophenyl boronic acid (481 mg, 2.88 mmol) were combined in a dry flask under argon. Toluene (20 mL) and dioxane (5 mL) were added, and the resulting solution was degassed for 30 minutes by a flow of argon. The degassing was continued during the addition of saturated aqueous sodium carbonate (6 mL) and [1,1′-bis(diphenylphosphino)-ferrocene]dichloro palladium(II), 1:1 complex with dichloromethane (98 mg, 0.12 mmol). The resulting mixture was then heated at 85° C. for 16 h before it was cooled to rt. Water was added, and the aqueous layer was extracted twice with ethyl acetate. The combined organic phases were then dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by flash chromatography (Biotage Flash 40) using 1:1 ethyl acetate/hexane to afford methyl 4-[2-(4′-nitro-1,1′-biphenyl-4-yl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate (730 mg, 79%). LC-MS ret. time 3.03; m/z 383.9 (MH+); 1H NMR (300 MHz, CDCl3) δ 1.65–1.73 (m, 2H), 2.17–2.21 (m, 2H), 3.37 (s, 2H), 3.68 (s, 3H), 3.71–3.78 (m, 4H), 7.70 (d, 2H), 7.77 (d, 2H), 8.02 (d, 2H), 8.31 (d, 2H).

出典