反应详情

Water (3.0 mL), sodium carbonate (1.1 g), tert-butyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylcarbamate (1.5 g), and bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)palladium(II) dichloride (30 mg) were added to an ethylene glycol dimethyl ether (10 mL) solution of methyl 4-chloro-2-nitrobenzoate (0.90 g), followed by heating to reflux under a nitrogen atmosphere for 1 hour and 30 minutes. The reaction mixture was cooled to room temperature, and then ethyl acetate and a 10% aqueous solution of citric acid were added thereto. The organic layer was separated, washed with a saturated aqueous solution of sodium chloride, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography [eluent: 95-85% hexane/ethyl acetate] to obtain 1.5 g of methyl 4-(2-(tert-butoxycarbonylamino)phenyl)-2-nitrobenzoate as a light yellow solid.

1. temperatureby heating
2. temperatureto reflux under a nitrogen atmosphere for 1 hour and 30 minutes
3. customThe organic layer was separated
4. washwashed with a saturated aqueous solution of sodium chloride
5. dry with materialdried over anhydrous magnesium sulfate
6. customthe solvent was evaporated under reduced pressure
7. customThe obtained residue was purified by silica gel column chromatography [eluent: 95-85% hexane/ethyl acetate]