Table 1.
1H (500 MHz) and 13C (125 MHz) NMR assignments for (1–3) in CDCl3.
| Attribution | 1 | 2 | 3 | |||
|---|---|---|---|---|---|---|
| 1H | 13C | 1H | 13C | 1H | 13C | |
| 2 | 7.50 (d, J = 2.8) | 143.0 | 7.51 (d, J = 2.8) | 143.1 | 7.74 (d, J = 2.8) | 142.8 |
| 3 | 6.96 (d, J = 2.8) | 104.7 | 6.96 (d, J = 2.8) | 104.6 | 7.26 (d, J = 2.8) | 105.0 |
| 3a | - | 101.9 | - | 102.2 | - | 101.9 |
| 4 | - | 157.1 | - | 157.1 | - | 157.7 |
| 4a | - | 114.9 | - | 115.5 | - | 113.8 |
| 5 | 7.90 (d, J = 9.3) | 117.5 | 7.91 (d, J = 9.3) | 117.9 | 7.65 (d, J = 9.3) | 114.3 |
| 6 | 7.13 (d, J = 9.3) | 114.5 | 7.16 (d, J = 9.3) | 114.9 | 7.00 (d, J = 9.3) | 115.4 |
| 7 | - | 151.9 | - | 151.6 | 142.8 | |
| 8 | - | 141.8 | - | 142.1 | - | 135.5 |
| 8a | - | 142.1 | - | 142.1 | - | 136.9 |
| 9a | - | 164.1 | - | 164.2 | - | 163.8 |
| 1′ | 4.75 (d, J = 7.1) | 70.3 | 4.32 (dd, J = 11.3; 4.9) 4.21 (dd, J = 11.3; 5.6) | 69.4 | 4.44 (dd, J = 11.1, 2.0) 4.04 (dd, J = 11.1, 9.3) | 65.3 |
| 2′ | 5.67 (dd, J = 7.1, 5.8) | 121.3 | 3.16 (dd, J = 5.6; 4.9) | 61.6 | 3.95 (dd, J = 9.3, 2.0) | 61.8 |
| 3′ | - | 137.4 | - | 58.3 | - | 58.7 |
| 4′ | 1.66 (s) | 25.8 | 1.32 (d, J = 1.5) | 24.6 | 1.37 (d, J = 1.5) | 25.5 |
| 5′ | 1.59 (s) | 18.0 | 1.28 (d, J = 1.5) | 18.9 | 1.36 (d, J = 1.5) | 23.5 |
| 1″ | 4.68 (d, J = 6.7) | 66.9 | 4.77 (d, J = 7.1) | 70.5 | - | - |
| 2″ | 5.49 (dd, J = 8.2, 5.2) | 120.3 | 5.67 (dd, J = 7.2, 5.8) | 121.1 | - | - |
| 3″ | - | 137.6 | - | 137.7 | - | - |
| 4″ | 1.71 (s) | 25.8 | 1.67 (s) | 25.8 | - | - |
| 5″ | 1.69 (s) | 18.3 | 1.61 (s) | 18.1 | - | - |
| OH | - | - | - | - | 4.55 (brs) | - |
| CH3O | 4.35 (s) | 58.9 | 4.35 (s) | 59.0 | 4.43 (s) | 58.6 |
Assignments were based on HMQC, HMBC, and NOESY experiments.