反应详情

2-[2-(3-Bromophenyl)chroman-6-yloxy]-5-nitropyridine was prepared as described for 5-nitro-2-(2-phenylchroman-6-yloxy)pyridine in Example 1(b) starting from 339 mg of 2-(3-bromophenyl)chroman-6-ol. The product was filtered through silica gel using toluene-ethyl acetate as an eluant and then crystallised from 2-propanol. 1H NMR (400 MHz, CDCl3) δ: 9.04 (d, 1H, J 2.9 Hz), 8.60 (dd, 1H, J 9.2, 2.9 Hz), 7.66 (bs, 1H), 7.55 (m, 1H), 7.48 (m, 1H), 7.39 (m, 1H), 7.20 (d, 1H, J 9.2 Hz), 7.01-6.93 (m, 3H), 5.17 (dd, 1H, J 10.1, 2.2 Hz), 2.97 (m, 1H), 2.72 (m, 1H), 2.20 (m, 1H), 2.00 (m, 1H).

1. filtrationThe product was filtered through silica gel
2. customcrystallised from 2-propanol