反应详情

To a solution of the 1,3-dichloro-5-ethynylbenzene (185 mg, 1.08 mmol) in anhydrous THF cooled to −78° C. under a N2 atmosphere was added nButLi (750 μL, 1.18 mmol). After 5 minutes, a solution of the intermediate from step E (320 mg, 1.3 mmol) in THF (5 mL) was added. The reaction was gradually warmed to room temperature over 30 minutes and quenched with saturated NH4Cl solution. The resulting bi-phasic mixture was extracted with ethyl acetate, washed with saturated NaCl solution, dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography using 20% ethyl acetate-hexanes to afford the product as a light yellow solid. 1H NMR (500 MHz, CDCl3): 9.54 (d, J=2.3 Hz, 1H), 8.85 (d, J=2.1 Hz, 1H), 7.92 (d, J=9.2 Hz, 1H), 7.62 (d, J=2.0 Hz, 2H), 7.5 (m, 2H), 7.34 (dd, J=2.5, 8.9 Hz, 1H), 4.04 (s, 3H). LC-MS: 3.92 min; (M+H)=356.0.

1. customquenched with saturated NH4Cl solution
2. extractionThe resulting bi-phasic mixture was extracted with ethyl acetate
3. washwashed with saturated NaCl solution
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash chromatography