反应详情

Brown powder; mp 110-111° C.; [α]D20 −55.0° (c 0.02, MeOH); UV (MeOH) λmax (log ε) 282 (3.25), 223 (3.84), 204 (4.38) nm; CD (MeOH) nm Δε276.5 −11.0; IR (NaCl) γmax 3348, 2927, 1507, 1456 cm−1; 1H NMR (CD3OD, 300 MHz) δ 1.99 (1H, m, H-3), 2.09 (1H, m, H-3), 2.67 (1H, m, H-4), 2.86 (1H, m, H-4), 4.91 (1H, overlapped, H-2), 6.24 (1H, d, J=2.4 Hz, H-8), 6.30 (1H, dd, J=2.4 and 8.2 Hz, H-6), 6.77 (2H, d, J=8.6 Hz, H-3′), 6.85 (1H, d, J=8.2 Hz, H-5), 7.22 (2H, d, J=8.6 Hz, H-2′) EIMS m/z 242 (M+, 100), 149 (18), 136 (23), 123 (62) 120 (89).