反应详情

To a suspension of (4,5-dichloro-2-nitro-phenyl)-carbamic acid tert.-butyl ester (Example A20) (10.0 g, 32.6 mmol), tetrakis(triphenylphosphine)palladium (3.76 g, 3.26 mmol) and potassium carbonate (13.5 g, 97.7 mmol) in dioxane/water (9:1; 100 ml) was added at RT trimethylboroxine (4.53 ml, 32.6 mmol). The reaction mixture was stirred under reflux conditions for 15 h, filtered, evaporated and purified by column chromatography on silica gel (hexane/ethyl acetate 19:1) to yield a light yellow solid (4.45 g, 48%).

1. filtrationfiltered
2. customevaporated
3. custompurified by column chromatography on silica gel (hexane/ethyl acetate 19:1)