反应详情

N-iodosuccinimide (13.6 mg, 0.06 mmol) and concentrated H2SO4 (5 μL) was added to a solution of 2 (14 mg, 0.04 mmol) in acetonitrile (1 mL). The mixture was stirred at room temperature for 36 h, concentrated at reduced pressure, and then diluted with ether (30 mL). The same workup and purification procedure as described for the isolation of 37 afforded 39 (10.5 mg, 55%) as a yellow powder. mp 255° C. (decomp.); 1H NMR (CDCl3) δ 8.78 (s, 1H, H4), 7.93 (s, 1H, H6), 6.75-6.90 (m, 3H, H2′+H5′+H6′), 6.08 (AB, 2H, 3′,4′-OCH2O—, Δδ=8.7 Hz, J=1.5 Hz), 5.97 (AB, 2H, 7,8-OCH2O—, Δδ=7.8 Hz, J=1.5 Hz), 5.23 (q, 2H, lactone-CH2—, J=8.7 Hz); MS (EI) m/z 474 [M]+.

1. concentrationconcentrated at reduced pressure
2. additiondiluted with ether (30 mL)
3. customThe same workup and purification procedure