反应详情

Commercially available 2-nitro-terephthalic acid 4-methyl ester (4.84 g, 21.49 mmol) in DCM (54 mL) was treated with tert-butanol (4.05 mL, 42.99 mmol), di-tert-butyl dicarbonate (12.19 g, 55.87 g) and DMAP (0.79 g, 6.45 mmol). After 4 days at room temperature, the reaction was diluted with DCM (100 mL), washed with 1N HCl (100 mL), aqueous NaHCO3 and finally with water. After drying over sodium sulphate and evaporation of the volatiles, the title compound was obtained as a brownish oil in more than quantitative yield (6.51 g). The crude was employed in the following step with no further purification.

1. washwashed with 1N HCl (100 mL), aqueous NaHCO3 and finally with water
2. dry with materialAfter drying over sodium sulphate and evaporation of the volatiles