Table 1.
1H-NMR (600 MHz) and 13C-NMR (150 MHz) spectra data of compounds 1 and 2 (in CD3OD, J in Hz, δ in ppm).
| Position | 1 | 2 | ||
|---|---|---|---|---|
| δH (J in Hz) | δC | δH (J in Hz) | δC | |
| 2 | 4.81 (1H, s) | 79.8 | 4.82 (1H, s) | 79.8 |
| 3 | 4.26 (1H, m) | 66.8 | 4.25 (1H, m) | 66.7 |
| 4 | 2.85 (1H, dd, J = 17.2, 1.7) | 29.8 | 2.85 (1H, dd, J = 17.2, 2.0) | 29.7 |
| 2.92 (1H, dd, J = 17.2, 4.5) | 2.92 (1H, dd, J = 7.2, 4.4) | |||
| 5 | – | 157.4 | – | 157.4 |
| 6 | 6.20 (1H, s) | 96.3 | 6.19 (1H, s) | 96.3 |
| 7 | – | 151.6 | – | 151.7 |
| 8 | – | 106.2 | – | 106.2 |
| 9 | – | 153.6 | – | 153.5 |
| 10 | – | 105.4 | – | 105.3 |
| 1′ | – | 132.0 | – | 132.0 |
| 2′ | 7.06 (1H, d, J = 1.9) | 115.1 | 7.03 (1H, d, J = 1.8) | 115.1 |
| 3′ | – | 146.2 | – | 146.1 |
| 4′ | – | 145.9 | – | 145.8 |
| 5′ | 6.79 (1H, d, J = 8.1) | 116.1 | 6.781 (1H, d, J = 8.2) | 116.0 |
| 6′ | 6.84 (1H, dd, J = 8.1, 1.9) | 119.1 | 6.83 (1H, dd, J = 8.2, 1.8) | 119.1 |
| 1′′ | – | 135.2 | – | 135.8 |
| 2′′ | 6.43 (1H, s) | 105.0 | 6.776 (1H, d, J = 2.0) | 112.2 |
| 3′′ | – | 149.2 | – | 148.8 |
| 4′′ | – | 135.1 | – | 146.3 |
| 5′′ | – | 149.2 | 6.62 (1H, d, J = 8.2) | 116.2 |
| 6′′ | 6.43 (1H, s) | 105.0 | 6.50 (1H, dd, J = 8.2, 2.0) | 119.4 |
| 7′′ | 4.60 (1H, br. d, J = 6.3) | 36.2 | 4.60 (1H, br. d, J = 6.3) | 35.7 |
| 8′′ | 2.91 (1H, dd, J = 15.9, 1.5) | 37.5 | 2.90 (1H, dd, J = 15.9, 1.5) | 37.8 |
| 3.12 (1H, dd, J = 15.9, 7.5) | 3.10 (1H, dd, J = 15.9, 7.4) | |||
| 9′′ | – | 171.0 | – | 170.9 |
| 3′′-OCH3 | – | – | 3.56 (3H, s) | 56.0 |
| 3′′, 5′′-OCH3 | 3.59 (6H, s) | 56.4 | – | – |