Table 2.
1H- (800 MHz) and 13C- (200 MHz) spectroscopic data for compound 4 (CDCl3) at 25 °C.
| Position | δC | δH, m (J in Hz) | HMBC (H→C) |
|---|---|---|---|
| 2 | 160.6 | ||
| 3 | 110.1 | 6.55 s | C-2, C-4, C-4a, C-1′ |
| 4 | 177.2 | ||
| 4a | 109.1 | ||
| 5 | 162.9 | ||
| 6 | 91.1 | 6.41 s | C-4a, C-5, C-7, C-8 |
| 7 | 166.3 | ||
| 8 | 103.9 | ||
| 8a | 154.9 | ||
| 1′ | 131.7 | ||
| 2′,6′ | 126.3 | 7.70 m | C-2, C-4′, C-2′, C-6′ |
| 3′,5′ | 128.7 | 7.45 m | C-1′, C-3′, C-5′ |
| 4′ | 131.1 | 7.49 m | C-2′, C-6′ |
| 2″ | 83.9 | ||
| 3″ | 206.1 | ||
| 4″ | 47.7 | 4.95 dd (10.2, 6.1) | C-7, C-8, C-8a, C-2″, C-3″, C-5″ |
| 5″ | 75.8 | 4.90 dd (10.2, 8.8) | C-7, C-8, C-3″, C-4″ |
| 4.84 dd (6.1, 8.8) | C-7, C-8, C-3″, C-4″ | ||
| 2″-Me | 24.0 | 1.57 s | C-2″, C-3″, 2″-Me |
| 2″-Me | 23.9 | 1.65 s | C-2″, C-3″, 2″-Me |
| 5-OMe | 56.7 | 3.96 s | C-5 |
| 7-COMe | 170.0 | ||
| 7-COMe | 21.4 | 2.11 s | 7-COMe |