Chromone → Chromanone

関与物質

反応手順

According to the general procedure, a solution of chromone (45 mg, 0.31 mmol), Hünig's base (540 μL) and rac-32 (9.8 mg, 0.0062 mmol, 2.0 mol %) in PhMe (3 mL) was pressurized with H2 to 100 bar and stirred for 48 h. Filtration of the reaction mixture and evaporation of the solvent gave the crude product, which was purified by column chromatography (30% EtOAc in hexane, silica gel) to give 48 (30 mg, 66%) as a colorless oil. 1H NMR35 (300 MHz, CDCl3): δ 7.90 (dd, 1H J=7.8, 1.5 Hz), 7.50-7.45 (m, 1H), 7.05-6.96 (m, 2H), 4.54 (t, 2H, J=6.6 Hz), 2.82 (t, 2H, J=6.3 Hz); 13C NMR (75.5 MHz, CDCl3): δ 192.0, 162.0, 136.1, 127.3, 121.5, 118.0, 67.1, 37.9.

情報源と証拠