Table 4.
NMR spectrum data (500 MHz for 1H and 125 MHz for 13C) of compound 2.
| Position | 1H (mult., J in Hz.)a | 13C | HMBC (1H→13C) |
|---|---|---|---|
| 2 | 162.5 | ||
| 3 | 5.99 (s) | 111.8 | C-2, C-2, C-4, C-4a |
| 4 | 177.5 | ||
| 4a | 108.5 | ||
| 5 | 160.6 | ||
| 6 | 6.29 (s) | 96.4 | C-4a, C-5, C-7, C-8 |
| 7 | 157.6 | ||
| 8 | 102.3 | ||
| 8a | 154.3 | ||
| 1′ × 2 | 1.47 (s) | 28.2 | C-1′, C-2′, C-3′ |
| 2′ | 77.9 | ||
| 3′ | 5.55 (d, 10.0) | 127.3 | C-2′, C-8 |
| 4′ | 6.70 (d, 10.0) | 115.3 | C-7, C-8, C-8a, C-2′ |
| 2-CH3 | 2.28 (3H, s) | 19.6 | C-2, C-3 |
| 5-OCH3 | 3.91 (s) | 56.4 | C-5 |
Note. Compound 2 in CDCl3; aif not indicated; the integration of each proton signal equal to one proton.