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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.

1. filtrationthe resulting solid was filtered
2. washwashed with a minimum amount of iPrOH
3. customdried under high vacuum