[C:1]1([C:7]2[O:8]C3C=C(C(OC)=O)C=CC=3N=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Li+].[OH-].O.[ClH:23]>C1COCC1.CO>[C:7]([Cl:23])(=[O:8])[C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1A mixture of methyl 2-phenyl-benzooxazole-6-carboxylate 1u (0.37 g, 1.46 mmol) and LiOH (0.10 g, 4.2 mmol) in THF (4 mL), MeOH (4 mL), and H2O (4 mL) was stirred at room temperature for 6 h. Aqueous 1N HCl solution was added to the mixture to adjust pH to 3-4. The resulting mixture was extracted with EtOAc (2×). The organic solution was washed with aq. NaCl, dried over Na2SO4 and concentrated to give 1t (0.34 g).
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