Potassium Carbonate → (5-Methyl-2-nitro-4-trifluoromethyl-phenyl)-carbamic acid tert-butyl ester

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To a suspension of (5-chloro-2-nitro-4-trifluoromethyl-phenyl)-carbamic acid tert-butyl ester (Example A1) (5.00 g, 14.7 mmol), tetrakis(triphenylphosphine)palladium (1.70 g, 1.47 mmol) and potassium carbonate (6.09 g, 44.1 mmol) in dioxane/water (9:1; 50 ml) was added at RT trimethylboroxine (2.04 ml, 14.7 mmol). The reaction mixture was stirred under reflux conditions for 15 h, filtered, evaporated and purified by column chromato-graphy on silica gel (hexane/ethyl acetate 9:1) to yield a light yellow solid (3.25 g, 69%).

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