Table 2.
1H (700 MHz) NMR Data (δH, J in Hz) for 3 and 6 in DMSO-d6a
| position | 3 | 6 | position | 3 | 6 |
|---|---|---|---|---|---|
| 2 | 2.91, d (14.4), 2.69, dd (14.4, 1.6) |
7.31, d (1.3) | 1' | 5.66, br s [d (1.7)]b | 5.60, d (1.7) [d (1.8)]b |
| 4 | 3.14, d (16.7), 3.01, dd (16.7, 1.2) |
7.43, br s | 2' | 3.98, dd (3.2, 1.8) [dd (3.4, 1.8)]b | 4.41, br s [dd (3.4, 1.9)]b |
| 5 | 7.38, s | 7.88, d (8.7) | 3' | 3.90, dd (9.5, 3.2) [dd (9.5, 3.4)]b | 3.97, br s [dd (9.2, 3.5)]b |
| 6 | 8.02, d (8.6) | 4' | 3.36, t (9.4) [t (9.5)]b | 3.42, m [t (9.2)]b | |
| 9 | 7.51, d (8.5) | 7.18, d (8.1) | 5' | 3.55, m | 3.62, m |
| 10 | 7.76, t (8.0) | 7.65, br t (8.2) | 6' | 1.13, d (6.2) | 1.23, d (6.2) |
| 11 | 7.44, d (7.5) | 7.29, d (7.4) | 3-OH | 5.00, br s | |
| 12 | 6.86, d (6.5) | 12-OH | 5.56, d (6.6) | ||
| 13 | 3.93, s | 3.90, s | 2’-OH | 5.00, br s | 5.15, d (4.1) |
| 14 | 1.31, s | 2.46, s | 3’-OH | 5.00, br s | 4.96, br d (5.4) |
| 4’-OH | 5.00, br s | 4.97, br d (6.0) |
a
Assignments are based on COSY, HMBC, HSQC, and NOESY experiments.
b
Coupling constants in square brackets are calculated after D2O was added into DMSO-d6.