C([O:8][C:9]1[CH:18]=[CH:17][C:12]2[CH2:13][O:14][B:15]([OH:16])[C:11]=2[CH:10]=1)C1C=CC=CC=1.[H][H]>CO.[Pd]>[OH:8][C:9]1[CH:18]=[CH:17][C:12]2[CH2:13][O:14][B:15]([OH:16])[C:11]=2[CH:10]=1H178 (13 mmol) was dissolved in MeOH (300 mL). To this solution under nitrogen was added 10% Pd/C (200 mg). The reaction mixture was vacuumed and backfilled hydrogen for 3 times, then stirred overnight at room temperature. After filtration and rotary evaporation, the residue was purified by recrystallization to give H181 (1.98 mg, 98% yield). 1H NMR (300 MHz, DMSO-d6): δ 9.29 (s, 1H), 9.04 (s, 1H), 7.18 (d, J=8.4 Hz, 2H), 6.87 (dd, J=8.1 & 2.4 Hz, 1H) and 4.86 (s, 2H) ppm. Mp 133-135° C.
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