反应详情

To a solution of ethyl 2-(2-bromothiophen-3-yl)acetate (24.00 g, 96.32 mmol) and 4-iodo-3-nitrobenzoyl chloride (30.00 g, 96.32 mmol) in anhydrous CH2Cl2 (100 mL) was added AlCl3 (38.53 g, 288.96 mmol) during a period of 4 hours at room temperature. The resulting mixture was stirred for 2 days. The reaction mixture was slowly poured onto 200 g of ice and allowed to warm to room temperature. The aqueous phase was extracted with Et2O (4×30 mL), and the combined organic layer was dried over MgSO4, filtered, and then concentrated in vacuo. MPLC purification of (Hex:EtOAc/4:1) of the residue gave 2 as a light yellow solid (20.00 g, 40%). 1H NMR (400 MHz, CDCl3) δ 8.26 (d, J=2.0 Hz, 1H), 8.21 (d, J=8.2 Hz, 1H), 7.69 (dd, J=2.0, 8.2 Hz, 1H), 7.48 (s, 1H), 4.19 (q, J=7.2 Hz, 2H), 3.66 (s, 2H), and 1.28 (t, J=7.2 Hz, 3H); 13C NMR (100 MHz, CDCl3) δ 183.84, 169.61, 153.25, 142.83, 141.87, 138.32, 136.49, 135.94, 133.07, 125.69, 124.50, 91.79, 61.76, 35.20, and 14.42.

1. extractionThe aqueous phase was extracted with Et2O (4×30 mL)
2. dry with materialthe combined organic layer was dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customMPLC purification of (Hex:EtOAc/4:1) of the residue