Table 1. 1H NMR Data of Compounds 1–5 in DMSO-d6 at 800 MHz.
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| position | δH, mult. (J in Hz) | δH, mult. (J in Hz) | δH, mult. (J in Hz) | δH, mult. (J in Hz) | δH, mult. (J in Hz) |
| 3 | 8.51, d (7.0) | 8.53, d (7.2) | 8.50, d (6.8) | 8.53, d (7.2) | 7.35, d (7.2) |
| 4 | 8.20, d (6.8) | 8.21, d (7.2) | 8.19, d (6.7) | 8.21, d (6.7) | 6.52, d (7.2) |
| 5 | 7.73, s | 7.73, s | 7.73, s | 7.74, s | 7.15, s |
| 8 | 7.78, s | 7.82, s | 7.79, s | 7.83, s | 7.58, s |
| α | 4.98, s | 5.04, d (17.3) | 4.93, s | 5.04, s | |
| 4.99, d (17.3) | |||||
| 10 | 6.98, d (2.6) | 6.95, d (2.4) | 6.91, d (1.8) | 7.13, d (2.1) | |
| 13 | 7.07, d (8.4) | 7.11, d (8.9) | 6.88, d (8.4) | 7.16, d (8.8) | |
| 14 | 6.89, dd (2.1, 8.4) | 6.92, dd (2.4, 8.9) | 6.74, dd (2.3, 6.8) | 7.00, dd (2.1, 8.6) | |
| 1′ | 4.53 m | ||||
| 3′ | 8.53, d (7.2) | 3.73, m | 8.54, d (6.9) | ||
| 3.39, m | |||||
| 4′ | 8.22, d (6.8) | 2.99, m | 8.22, d (6.7) | ||
| 5′ | 7.76, s | 6.85, s | 7.76, s | ||
| 8′ | 7.84, s | 5.71, s | 7.84, s | ||
| α′ | 5.01, s | 3.37, m | 5.01, s | 9.89, s | |
| 2.96, m | |||||
| 10′/14′ | 7.07, dd (5.2, 8.4) | 7.06, d (8.7) | 7.08, dd (8.8) | 7.86, d (8.7) | |
| 11′/13′ | 6.74, dd (2.1, 8.4) | 6.77, d (8.7) | 6.75, dd (1.7, 8.7) | 6.95, d (8.7) | |
| 1-OH | 6.54 brs | ||||
| CH3N-2 | 4.27, s | 4.30, s | 4.28, s | 4.32, s | 4.32, s |
| CH3O-6 | 4.06, s | 4.04, s | 4.06, s | 4.07, s | 4.07, s |
| CH3O-7 | 3.87, s | 3.93, s | 3.88, s | 3.94, s | 3.94, s |
| 12-OH | 9.73, s | ||||
| CH3O-12 | 3.64, s | 3.69, s | 3.69, s | ||
| CH3N-2′ | 4.28, s | 2.84, s | 4.29, s | ||
| CH3O-6′ | 4.07, s | 3.74, s | 4.07, s | ||
| CH3O-7′ | 3.96, s | 3.29, s | 3.96, s |