反应详情

To a solution of anhydrous acetonitrile (3.12 mL, 56.2 mmol, 1 eq.) in tetrahydrofuran (281 mL, 0.2 M) was added lithium diisopropylamine (1.8 M in heptane/ethylbenzene/tetrahydrofuran, 31.2 mL, 56.2 mmol, 1 eq.) at −78° C. After 20 minutes at −78° C., tropylium tetrafluoroborate (10 g, 56 mmol, 1 eq.) was added. After 10 minutes, the reaction was concentrated in vacuo and the residue was diluted with ethyl acetate and washed with water. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to provide a brown oil, which was purified by silica gel chromatography (Gradient: 0% to 10% ethyl acetate in heptane) to provide #61 (1.88 g, 25%) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 6.69-6.71 (m, 2H), 6.27-6.32 (m, 2H), 5.28-5.33 (m, 2H), 2.61 (d, J=7.2 Hz, 2H), 2.26-2.34 (m, 1H).

1. waitAfter 10 minutes
2. concentrationthe reaction was concentrated in vacuo
3. additionthe residue was diluted with ethyl acetate
4. washwashed with water
5. dry with materialThe organic layer was dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customto provide a brown oil, which
9. customwas purified by silica gel chromatography (Gradient: 0% to 10% ethyl acetate in heptane)