Table 3.
NMR spectrum data (500 MHz for 1H and 125 MHz for 13C) of compound 1.
| Position | 1H (mult., J in Hz.)a | 13C | HMBC (1H→13C) |
|---|---|---|---|
| 2 | — | 164.2 | |
| 3 | 6.57 (s) | 103.8 | C-2, C-4, C-4a, C-1′ |
| 4 | — | 183.0 | |
| 4a | — | 105.8 | |
| 5 | — | 152.1 | |
| 6 | — | 130.3 | |
| 7 | — | 154.9 | |
| 8 | 6.59 (s) | 93.3 | C-6, C-7, C-8a |
| 8a | — | 153.2 | |
| 1′ | — | 123.6 | |
| 2′ | 7.83 (dd, 8.9, 1.9) | 128.1 | C-2, C-4′, C-6′ |
| 3′ | 7.01 (dd, 8.9, 1.9) | 114.5 | C-1′, C-4′, C-5′ |
| 4′ | — | 162.6 | |
| 5′ | 7.01 (dd, 8.9, 1.9) | 114.5 | C-1′, C-3′, C-4′ |
| 6′ | 7.83 (dd, 8.9, 1.9) | 128.1 | C-2, C-2′, C-4′ |
| 5-OH | 13.10 (s) | C-4a, C-5, C-6 | |
| 7-OH | 6.53 (s) | C-6, C-7, C-8 | |
| 4′-OCH3 | 3.90 (3H, s) | 55.5 | C-4′ |
| 6-OCH3 | 4.04 (3H, s) | 60.8 | C-6 |
Note. Compound 1 in CDCl3; aif not indicated; the integration of each proton signal equal to one proton.