Table 3.
NMR data for 7 and 8 (500 MHz for 1H, 125 MHz for 13C; chemical shifts in δ, coupling constants in Hz, CDCl3).
| Position | 7 | 8 | ||
|---|---|---|---|---|
| δC | δH mult (J in Hz) | δC | δH mult (J in Hz) | |
| 2 | 84.3 | 84.3 | ||
| 3 | 39.8 | 3.04, dd (17.2, 0.6) | 40.7 | 3.07, d (17.2) |
| 3.17, d (17.2) | 3.48, d (17.2) | |||
| 4 | 194.1 | 194.9 | ||
| 4a | 107.7 | 107.5 | ||
| 5 | 162.0 | 161.9 | ||
| 6 | 110.7 | 6.55, dd (8.6, 0.6) | 110.6 | 6.54, dd (8.6, 0.6) |
| 7 | 139.2 | 7.42, t (8.6) | 139.0 | 7.40, t (8.6) |
| 8 | 107.7 | 6.54, dd (8.6, 0.6) | 107.5 | 6.49, dd (8.6, 0.6) |
| 8a | 159.2 | 159.3 | ||
| 9 | 87.6 | 4.43, dd (4.0, 0.6) | 86.5 | 4.36, dd (3.4, 0.6) |
| 10 | 30.1 | 2.83, m | 29.7 | 2.85, m |
| 11 | 36.2 | 2.21, dd (17.8, 4.6) | 36.4 | 2.21, dd (17.8, 4.6) |
| 2.89, dd (17.8, 9.2) | 3.01, dd (17.8, 9.2) | |||
| 12 | 175.3 | 175.7 | ||
| 13 | 20.9 | 1.28, d (6.9) | 20.7 | 1.18, d (6.9) |
| 14 | 168.9 | 169.2 | ||
| 15 | 53.8 | 3.72, s | 53.7 | 3.74, s |
| 5-OH | 11.43, s | 11.45, s | ||