反应详情

The NBS bromination of 1b according to the procedure outlined for the preparation of 2a gave >90% yield of 2b as a colorless oil. b.p.: 138° C. at 0.15 mmHg. 1H NMR (250 MHz, 25° C., CDCl3): δ6.82 (d, 1H, Ar—H), 6.52 (d, 1H, Ar—H), 3.64 (s, 3H, OCH3), 2.79 (t, 2H, CH2CO2Me), 2.33 (t, 2H, Ar—CH2), 1.93 (tt, 2H, CH2CH2CH2).