反应详情

A mixture of 3-bromo-2-(pyridin-4-yl)-1-oxaspiro[4.4]non-2-en-4-one (0.2 g, 0.68 mmol), 2-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)methyl)quinoline (0.25 g, 0.82 mmol), and Cs2CO3 (1.25 g, 6.68 mmol) in toluene (10 mL) and water (2 mL) was degassed, Pd(dppf)Cl2 (0.05 g, 0.014 mmol) was added under an inert atmosphere and again degassed. Then the reaction was refluxed for 3 h. and was filtered through a pad of Celite®, the filtrate was diluted with EtOAc (50 mL), washed with water (20 mL), brine (20 mL), dried over Na2SO4, filtered and concentrated in vacuo to obtain the crude product. The crude material was purified via silica gel column chromatography to afford 2-(pyridin-4-yl)-3-(4-(quinolin-2-ylmethoxy)phenyl)-1-oxaspiro[4.4]non-2-en-4-one (20 mg, 5%) as a solid. 1H NMR (500 MHz, d6-DMSO): δ 8.68 (d, J=8.5 Hz, 2 H), 8.44 (d, J=7.9 Hz, 1 H), 8.02 (t, J=8.4 Hz, 2 H), 7.80 (t, J=8.2 Hz, 1 H), 7.68 (d, J=8.2 Hz, 1 H), 7.63 (t, J=8.5 Hz, 1 H), 7.48 (d, J=8.5 Hz, 2 H), 7.18 (d, J=7.4 Hz, 2 H), 7.12 (d, J=7.5 Hz, 2 H), 5.42 (s, 2 H), 2.08-1.82 (m, 8 H). MS: [M+H]: m/z=449.2. HPLC: 96.9% (RT-2.24 min), Column: Acquity BEH—C-18, 50×2.1 mm, 1.7 um. Mobile Phase: 0.025% TFA in Water (A), ACN (B), Flow rate: 0.5 ml/min (Gradient).

1. customwas degassed
2. customagain degassed
3. temperatureThen the reaction was refluxed for 3 h.
4. filtrationwas filtered through a pad of Celite®
5. additionthe filtrate was diluted with EtOAc (50 mL)
6. washwashed with water (20 mL), brine (20 mL)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto obtain the crude product
11. customThe crude material was purified via silica gel column chromatography