反应详情

6-(5-Nitropyridin-2-yloxy)-2-phenylchroman-4-ol was prepared as described for 5-nitro-2-(2-phenylchroman-6-yloxy)pyridine in Example 1 (b) starting from 1.5 g of 2-phenylchroman-4,6-diol. The product was passed through a silica gel column using toluene-ethyl acetate (4:1) as an eluant and then crystallised from 2-propanol. 1H NMR (400 MHz, d6-DMSO) δ: 9.04 (d, 1H, J 2.7 Hz), 8.61 (dd, 1H, J 9.1, 2.7 Hz), 7.50-7.36 (m, 5H), 7.25 (d, 1H, J 2.7 Hz), 7.22 (d, 1H, 9.1 Hz), 7.00 (dd, 1H, J 8.7, 2.7 Hz), 6.88 (d, 1H, J 8.7 Hz), 5.65 (d, 1H, J 6.3 Hz), 5.30 (dd, 1H, J 11.9, 1.3 Hz), 4.99 (m, 1H), 2.33 (m, 1H), 1.98 (m, 1H).

1. customcrystallised from 2-propanol