反应详情

温度

95 °C

A mixture of 2-chloro-3-fluoropyridine (21.0 g, 0.16 mol), benzophenone imine (32.3 g, 0.18 mol), Cs2CO3 (73.0 g, 0.23 mol), BINAP (5.96 g, 9.6 mmol), palladium(II) acetate (1.45 g, 6.4 mmol) and toluene (370 ml) were heated to 95° C. for 42 h, then cooled, filtered and the residue extracted with further toluene (2×210 ml). The filtrate was washed with 0.5 N hydrochloric acid (200 ml) and saturated aqueous NaHCO3 (200 ml), dried over anhydrous MgSO4 and concentrated in vacuo, affording crude benzhydrylidene(3-fluoropyridin-2-yl)amine as a brown oil (49.4 g) which was used directly without further purification: m/z (ES+) 277 (100%, [MH]+)

1. temperaturecooled
2. filtrationfiltered
3. extractionthe residue extracted with further toluene (2×210 ml)
4. washThe filtrate was washed with 0.5 N hydrochloric acid (200 ml) and saturated aqueous NaHCO3 (200 ml)
5. dry with materialdried over anhydrous MgSO4
6. concentrationconcentrated in vacuo