Ammonium formate → Dihydrogenistein

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Compound 22 was prepared following the general procedure described by Wähälä K. and Hase T. A., Heterocycles 28:183-86 (1989), herein incorporated by reference in its entirety. To a 50 mL round bottom flask was added genistein (270 mg, 1 mmol) and ammonium formate (1.08 g, 4 mmol). The flask was purged with N2, followed by addition of methanol (20 mL) and 10% Pd/C (255 mg). Upon consumption of the starting material (measured by reverse phase HPLC), the reaction mixture was passed through a pad of silica gel with EtOAc/Hex as the eluent. The solvent was concentrated in vacuo to afford crude 22. Purified by recrystallization from CHCl3/MeOH to afford 22 (144 mg, 53%) as brown crystals. Analytical data for isoflavanone 22: 1H NMR (500 MHz, DMSO) δ 12.19 (s, 1H), 10.84 (br s, 1H), 9.42 (br s, 1H), 7.08 (d, J=8.5 Hz, 2H), 6.73 (d, J=8.5 Hz, 2H), 5.91-5.90 (s, 2H), 4.53 (d, J=6.5 Hz, 2H), 4.00 (t, J=6.5 Hz, 1H); 13C NMR (125 MHz, DMSO) δ 197.6, 167.4, 164.6, 163.6, 157.4, 130.4, 126.3, 116.0, 102.5, 96.9, 95.5, 49.9; LCMS: Mass calculated for C15H12O5, [M+H]+, 273. Found 273.

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