Table 4.
1H NMR data (500 MHz, CDCl3) for 1–3.
| Position | 1 | 2 | 3 |
|---|---|---|---|
| δH (J in Hz) | |||
| 3 | 3.87 (dd, 8.9, 8.6) | 3.77 (dd, 8.7, 8.6) | 3.48 (dd, 10.5, 8.9) |
| 4 | 5.21 (d, 8.9) | 5.14 (d, 8.9) | 4.96 (d, 8.9) |
| 8 | 6.67 (br s) | 6.76 (br s) | 6.81 (br s) |
| 10 | 6.62 (br s) | 6.58 (br s) | 6.59 (br s) |
| 15 | 2.33 (s) | 2.36 (s) | 2.38 (s) |
| 16 | 3.83 (s) | 3.78 (s) | 3.82 (s) |
| 3′ | 2.86 (ddd, 12.8, 8.6, 5.3) | 2.82 (ddd, 12.7, 8.6, 5.4) | 3.06 (ddd, 10.5, 8.3, 4.7) |
| 4′α | 2.58 (dd, 15.6, 5.3) | 2.55 (dd, 15.5, 5.4) | 2.99 (dd, 18.6, 4.7) |
| 4′β | 2.37 (dd, 15.6, 12.8) | 2.36 (dd, 15.5, 12.7) | 2.85 (dd, 18.6, 8.3) |
| 8′ | 6.69 (br s) | 6.69 (br s) | 6.69 (br s) |
| 10′ | 6.70 (br s) | 6.69 (br s) | 6.68 (br s) |
| 15′ | 2.42 (s) | 2.41 (s) | 2.42 (s) |
| 16′ | 3.87 (s) | 3.84 (s) | 3.84 (s) |
| 11-OH | 12.11 (br s) | - | - |
| 11-OMe | - | 3.91 (s) | 3.91 (s) |
| 2′-OMe | 3.50 (s) | 3.51 (s) | 3.11 (s) |
| 11′-OH | 12.30 (br s) | 12.36 (s) | 12.50 (s) |