4-(1-(4-(Perfluoropropyl)phenyl)-1H-1,2,4-triazol-3-yl)benzoic acid (400 mg, 0.92 mmol) was dissolved in 7 mL of isopropanol and treated with diphenylphosphoryl azide (0.300 g, 1.09 mmol) and triethylamine (0.200 g, 2.0 mmol). The solution was allowed to stir for 6 h, then it was cooled to 0° C. and the resulting solid was filtered, washed with a minimum amount of iPrOH, and dried under high vacuum to give the azide as an off-white solid (0.120 g, 30%). This solid was not further characterized, but used directly in the subsequent Curtius rearrangement to prepare molecule A113, using conditions described in Example 39.
