A mixture of 4-acetoxy-3-nitrobenzoic acid (0.44 g, 1.95 mmol) and thionyl chloride (5 ml) was heated under reflux for 1.5 h. The reaction mixture was cooled to room temperature and excess reagent was removed under reduced pressure to give the crude acid chloride. The amide was prepared as described in the Amide Coupling section above using the acid chloride and 2-(4-aminophenyl)-6-methoxybenzothiazole (0.50 g, 1.95 mmol) in dry THF (25 ml) containing diisopropylethylamine (0.302 g, 2.34 mmol) to give the title compound (0.728 g, 86%) as a tan-coloured solid after work-up.
