反应详情

6-Hydroxyflavane (0.150 g) was dissolved in 3 ml of dry DMF under nitrogen. KF (0.117 g) was added and the solution was stirred for 30 minutes at +120° C. The solution was cooled a bit and 2-chloro-3-nitropyridine was added (0.212 g) and stirred for 7 hours at +120° C. and overnight at room temperature. The reaction mixture was taken up with EtOAc and 1M HCl and water were added and phases separated. Organic phase was washed with water and pH was adjusted to 7 with 1M NaOH. Organic phase was washed with water, brine and dried over Na2SO4. Product was purified by column chromatography (CH2Cl2:n-heptane/80:20). 1H-NMR (400 MHz; d6-DMSO): δ 8.55 (dd, 1H, J=7.9 Hz, J=1.7 Hz), 8.42 (dd, 1H, J=4.9 Hz, J=1.7 Hz), 7.51-7.29 (m, 6H), 7.02-6.92 (m, 2H), 6.88 (d, 1H, J=8.7 Hz), 5.14 (dd, 1H, J=10.0 Hz, J=2.1 Hz), 3.05-2.92 (m, 1H), 2.78-2.68 (m, 1H), 2.22-2.13 (m, 1H), 2.07-1.95 (m, 1H).

1. additionwas added (0.212 g)
2. stirringstirred for 7 hours at +120° C. and overnight at room temperature
3. additionwere added
4. customphases separated
5. washOrganic phase was washed with water and pH
6. washOrganic phase was washed with water, brine
7. dry with materialdried over Na2SO4
8. customProduct was purified by column chromatography (CH2Cl2:n-heptane/80:20)