Table 1.
1H and 13C NMR data for DON and compound A (in CDCl3 at 30°C)
| Position | 1H-NMR δH, ppm (mult., J in Hz) | 13C-NMR δC (ppm) | ||
|---|---|---|---|---|
| DON | Compound A | DON | Compound A | |
| 2 | 3.6 (d, 4.5) | 3.70 (s) | 80.8 | 83.8 |
| 3 | 4.5 (ddd, 4.5, 4.5, 11.0) | 4.33 (dd, 3.0, 7.5) | 69.2 | 72.5 |
| 4 | 2.23 (dd, 4.0, 15.0) | 2.93 (dd, 7.5, 15.5) | 43.4 | 46.1 |
| 2.10 (dd, 11.0, 15.0) | 1.60 (dd, 3.0, 15.5) | |||
| 5 | – | – | 46.5 | 46.2 |
| 6 | – | – | 52.6 | 51.8 |
| 7 | 4.90 (br. s) | 4.75 (s) | 74.1 | 74.0 |
| 8 | – | – | 199.6 | 199.9 |
| 9 | – | – | 136.6 | 136.3 |
| 10 | 6.55 (d, 6.0) | 6.53 (dd, 1.5, 6.0) | 137.7 | 138.1 |
| 11 | 4.57 (d, 56.0) | 4.19 (d, 6.0) | 70.5 | 70.0 |
| 12 | – | – | 64.3 | 65.3 |
| 13 | 3.35 (d, 4.0) | 3.16 (d, 4.5) | 47.8 | 46.2 |
| 3.22 (d, 4.0) | 3.11 (d, 4.5) | |||
| 14 | 1.33 (3H, s) | 1.22 (3H, s) | 13.8 | 14.1 |
| 15 | 3.90 (d, 12.0) | 3.80 (d, 12.0) | 62.0 | 62.1 |
| 3.74 (d, 12.0) | 3.72 (d, 12.0) | |||
| 16 | 1.90 (br. s) | 1.87 (3H, s) | 15.2 | 15.3 |