反应详情

温度

110 °C

A mixture of 195d (2.7 g, 9.6 mmol) and acetic acid (10 mL) was heated at 110° C. for 2 h. The mixture was cooled to room temperature and neutralized with aqueous sodium carbonate solution and extracted with ethyl acetate (3×30 mL). The combined organic phase was concentrated under reduced pressure to afford 195e as a yellow solid (1.6 g, 88%). MS-ESI: [M+H]+ 189.3. 1H NMR (500 MHz, DMSO-d6) δ 10.28 (s, 1H), 7.02 (d, J=5.5 Hz, 1H), 6.63 (s, 1H), 6.52 (pt, J=5.5 Hz, 1H), 2.66 (t, J=6.0 Hz, 2H), 2.57 (t, J=6.0 Hz, 2H), 1.83-1.82 (m, 2H), 1.73-1.72 (m, 2H).

1. extractionextracted with ethyl acetate (3×30 mL)
2. concentrationThe combined organic phase was concentrated under reduced pressure