反应详情

To a previously nitrogen-flushed vessel, add zinc dust (<10 microns, 0.196 g, 3 mmol) and 1,2-dibromoethane (0.023 mL, 0.27 mmol) to THF (0.5 mL). Heat the solution until bubbles appear. Repeat the heating twice and cool to room temperature. Add chlorotrimethylsilane (15 μL) and 2-bromothiazole (90 μL, 1 mmol) in THF (0.4 mL). Stir at room temperature for 15 min. Add 5-iodo-N-methyl-N-propyl-isophthalamic acid methyl ester (541 mg, 1.5 mmol), tetrakis(triphenylphosphine)palladium (0) (15 mg) and flush the mixture with nitrogen again before heating to reflux for 10 h. Cool to room temperature, concentrate and purify (silica gel chromatography, eluting with 0:100 to 40:60 ethyl acetate:hexanes) to give the title compound (95%).

1. customTo a previously nitrogen-flushed vessel
2. temperatureHeat the solution until bubbles
3. temperaturebefore heating
4. temperatureto reflux for 10 h
5. temperatureCool to room temperature
6. concentrationconcentrate
7. custompurify
8. wash(silica gel chromatography, eluting with 0:100 to 40:60 ethyl acetate:hexanes)