C1(P([N:15]=[N+:16]=[N-:17])(C2C=CC=CC=2)=O)C=CC=CC=1.C(N(CC)CC)C.[C:25]1([C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)[CH:30]=[CH:29][CH:28]=[C:27]([C:31](O)=[O:32])[CH:26]=1>C(O)(C)C>[C:25]1([C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)[CH:30]=[CH:29][CH:28]=[C:27]([C:31]([N:15]=[N+:16]=[N-:17])=[O:32])[CH:26]=1To a vial (8 mL) diphenylphosphoryl azide (0.39 mL, 1.8 mmol) and triethylamine (0.25 mL, 1.8 mmol) were added to a stirred solution of biphenyl-3-carboxylic acid (0.30 g, 1.5 mmol) in isopropanol (3 mL). The vial was closed with a lid, and the reaction mixture was stirred for 16 hours at room temperature. The reaction mixture was concentrated, and water (50 mL) was added. The mixture was extracted with ethyl acetate (3×50 mL). The combined extracts were dried over sodium sulfate, filtered, and concentrated to provide the title compound (0.40 g, 100%) was used in the next reaction without characterization or purification.
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