反应详情

Needles; UV (MeOH) λmax (log ε) 328 (4.36), 315 (4.44), 215 (4.45) nm; IR (NaCl) γmax 3339, 1612, 1442, 1292, 1151, 1000 cm−1; 1H NMR (CD3OD, 500 MHz) δ 6.25 (1H, t, J=2.2 Hz, H-4′), 6.73 (1H, dd, J=2.2, 8.4 Hz, H-5), 6.76 (2H, d, J=2.2 Hz, H-2′ and 6′), 6.90 (1H, d, J=1.8 Hz, H-7), 6.91 (1H, s, H-3), 7.34 (1H, d, J=8.3 Hz, H-4); 13C NMR (CD3OD, 125 MHz) δ 98.4 (C-7), 102.2 (C-3), 103.5 (C-4′), 103.9 (C-2′ and C-6′), 113.2 (C-5), 122.0 (C-4), 123.0 (C-9), 133.8 (C-1′), 156.1 (C-6), 156.8 (C-2), 157.2 (C-8), 159.9 (C-3′); EIMS m/z 242 (M+, 100), 213 (9), 121 (10).