Trimellitic anhydride → 1,3-Dioxo-2-(3-(5-phenylbenzo[d]oxazol-2-yl)phenyl)isoindoline-5-carboxylic acid

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Prepared by the method of Example 1b), from 2-(3-aminophenyl)-5-phenylbenzoxazole (40 mg, 0.14 mmol) and 1,2,4-benzenetricarboxylic anhydride (30 mg, 0.16 mmol) the title compound was obtained, 45 mg (70%). 1H NMR (DMSO) δ 8.45(dd, 1H), 8.38(d, 2H), 8.30(dt, 1H), 8.12(m, 2H), 7.9(d, 1H), 7.78(m, 5H), 7.51(t, 2H), 7.40(t, 1H). MS 459 m/z (M−H)−.

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