tert-Butanol → Tert-butyl (3-methoxy-2-nitrophenyl)carbamate

Participants

Reaction Conditions

Reaction Steps

3-Methoxy-2-nitrobenzoic acid (10.25 g) was suspended in toluene (200 ml), and triethylamine (8.65 ml) and diphenylphosphoryl azide (13.4 ml) were added dropwise at room temperature. The mixture was stirred at 90° C. for 1.5 hr, triethylamine (29 ml) and 2-methylpropan-2-ol (15 ml) were added, and the mixture was further stirred at 90° C. for 2 hr. The reaction mixture was concentrated under reduced pressure, diluted, with ethyl acetate, 0.5M hydrochloric acid (200 ml) was added, and the mixture was filtered through celite. The organic layer of the filtrate was collected, washed with saturated aqueous sodium hydrogen carbonate, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel chromatography, and a fraction eluted with ethyl acetate-hexane (5:95-1:1) was concentrated under reduced pressure to give the object product (10.18 g).

Provenance & Evidence