反应详情

To a suspension of 2-picolic acid (3.73 g, 30.3 mmol) and 2-amino-4-methoxybenzophenone (5.0 g, 30.3 mmol) at −30° C. dissolved in pyridine (150 mL) was added POCl3 (3.7 mL, 45.4 mmol) in 5 min. the reaction mixture was stirred for 3 hr at the temperature, and stirred at rt overnite. The reaction mixture was poured into cold water and extracted with EtOAc (3×). The combined extract was dried to provide the product (7.67 g, 93%): 1H NMR (methanol-d4) δ ppm 2.65 (s, 3H), 3.92 (s, 3H), 6.78 (m, 1H), 7.60 (m, 1H), 8.00 (m, 1H), 8.06 (m, 1H), 8.21 (d, J=7.63 Hz, 1H), 8.59 (t, J=2.29 Hz, 1H), 8.76 (d, J=3.97 Hz, 1H). LC-MS (retention time: 1.56, Method D), MS m/z 271 (M++1).

1. stirringstirred at rt overnite
2. extractionextracted with EtOAc (3×)
3. extractionThe combined extract
4. customwas dried