反应详情

To a stirred solution of methyl (2-bromothiophen-3-yl)acetate (120 mg, 0.51 mmol) and 4-iodo-3-nitrobenzoyl chloride (150 mg, 0.48 mmol) in anhydrous CH2Cl2 (10 mL) was added AlCl3 (260 mg, 1.95 mmol) in four portions in 10-minute intervals at room temperature. The resulting mixture was stirred overnight. The reaction mixture was slowly poured onto 5 g of ice and allowed to warm to room temperature. The aqueous phase was extracted with CH2Cl2 (3×15 mL). The combined organic layer was dried over MgSO4, filtered, and then concentrated in vacuo. MPLC purification (Hex:EtOAc/5:1) of the residue gave 2 as a light yellow solid (158 mg, 61%). 1H NMR (400 MHz, CDCl3) δ 8.27 (d, J=2.0 Hz, 1H), 8.22 (d, J=8.0 Hz, 1H), 7.70 (dd, J=2.0, 8.2 Hz, 1H), 7.48 (s, 1H), 3.74 (s, 3H), and 3.68 (s, 2H); 13C NMR (100 MHz, CDCl3) δ 183.8, 170.0, 153.2, 142.9, 141.9, 138.3, 136.5, 135.8, 133.1, 125.7, 124.5, 91.8, 52.6, and 35.0.

1. extractionThe aqueous phase was extracted with CH2Cl2 (3×15 mL)
2. dry with materialThe combined organic layer was dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customMPLC purification (Hex:EtOAc/5:1) of the residue