反应详情

2-(3,5-Difluorophenyl)-6-hydroxychroman-4-one was prepared as described for 2-(3-fluorophenyl)-6-hydroxychroman-4-one in Example 9(a) starting from 1.0 g of 2′,5′-dihydroxyacetophenone and 1.12 g of 3,5-difluorobenzaldehyde. The product was recrystallised from acetic acid. 1H NMR (400 MHz, d6-DMSO) δ: 9.47 (s, 1H), 7.30-7.23 (m, 3H), 7.12 (d, 1H, J 2.9 Hz), 7.06 (dd, 1H, J 8.8, 2.9 Hz), 7.00 (d, 1H, J 8.8 Hz), 5.60 (dd, 1H, J 13.1, 2.8 Hz), 3.15 (dd, 1H, J −16.8, 13.1 Hz), 2.85 (dd, 1H, J −16.8, 2.8 Hz).

1. customThe product was recrystallised from acetic acid