反应详情

温度

140 °C

A mixture of (3,5-dimethoxy-4-1-propylphenyl)ethene (0.649 g, 3.15 mmol), 1-bromo-2,4-difluorobenzene (1.23 g, 6.37 mmol), dihydrogen di-μ-chlorotetrkis(di-tert-butylphosphinito-KP)dipalladate (0.1409 g, 0.151 mmol), Bu4NI (0.582 g, 1.58 mmol) and K2CO3 (1.45 g, 10.5 mmol) in DMF (10 mL) was heated at 140° C. under argon. After the reaction was complete (6 h), the reaction mixture was poured into water (10 ml). The aqueous was acidified with 2NHCl and extracted with ether (2×50 mL). The extract was washed with saturated sodium chloride and then dried over anhydrous Na2SO4. Evaporation of ether followed by flash chromatography using 2% ethyl acetate in hexane afforded 1-(2,4-difluorophenyl)-2-(3,5-d-imethoxy-4-1-propylphenyl)ethene (31) quantitatively as a yellowish crystal. 1HNMR (CDCl3, ppm): δ 1.32 (d, J=7.1 Hz, 6H), 3.63 (qint, J=7.1 Hz, 1H), 3.90 (s, 6H), 6.76 (s, 2H), 7.08 (d, J=17 Hz, 1H), 7.27 (d, J=17 Hz, 1H), 7.63 (d, J=8 Hz, 2H), 8.13 (d, J=8 Hz, 2H).

1. custom(6 h)
2. extractionextracted with ether (2×50 mL)
3. washThe extract was washed with saturated sodium chloride
4. dry with materialdried over anhydrous Na2SO4
5. customEvaporation of ether