反应详情

A solution of the product of Example 9A (10 g, 75.19 mmol) and N,N-Dimethylformamide dimethyl acetal (11 mL, 82.71 mmol) in toluene (100 mL) was heated at reflux for 6 hours. After cooling to room temperature, the solution was concentrated under vacuum to provide the title compound as a yellow solid (13.78 g, 98%). 1H NMR (300 MHz, DMSO-d6) δ ppm: 2.41 (s, 3H), 3.06 (s, 3H), 3.14 (s, 3H), 6.87 (d, J=7.7 Hz, 1H), 7.89 (d, J=8.1 Hz, 1H), 8.59 (s, 1H).

1. temperatureat reflux for 6 hours
2. concentrationthe solution was concentrated under vacuum