The NMR spectroscopic data for 2a, 3 in CDCl3 and 2 in MeOD.
| Position | 2a | 2 | 3 | |||
|---|---|---|---|---|---|---|
| δ C | δ H mult. (J in Hz) | δ C | δ H mult. (J in Hz) | δ C | δ H mult. (J in Hz) | |
| 1 | 137.6 s | 131.7 s | 71.0 s | |||
| 2 | 122.6 d | 5.69 (m, 1H) | 140.8 d | 6.98 (t, 1H, 2.4) | 74.1 d | 3.61 (brs, 1H) |
| 3 | 23.7 t | 2.05 (m, 1H) | 24.6 t | 2.02 (m, 1H) | 30.0 t | 1.79 (m, 2H) |
| 1.24 (m, 1H) | 1.22 (m, 1H) | |||||
| 4 | 45.2 d | 1.54 (m,1H) | 45.6 d | 1.53 (m, 1H) | 41.1 d | 1.63 (tt, 1H, 12.0, 6.0) |
| 5 | 26.5 t | 1.55 (m, 1H) | 26.4 t | 2.48 (br d, 1H, 16.0) | 22.3 t | 1.54 (t, 1H, 8.0) |
| 1.36 (m, 1H) | 2.08 (m, 1H) | 1.34 (td, 1H, 8.0, 4.0) | ||||
| 6 | 26.7 t | 1.76 (m, 1H) | 28.5 t | 2.34 (br d, 1H, 16.0) | 33.7 t | 1.75 (t, 1H, 2.0) |
| 1.52 (m, 1H) | 2.01 (m, 1H) | 1.50 (t, 1H 3.6) | ||||
| 7 | 67.2 t | 4.01 (t, 2H, 12.0) | 171.1 s | 27.8 q | 1.22 (s, 3H) | |
| 8 | 72.9 s | 72.9 s | 72.8 s | |||
| 9 | 27.5 q | 1.19 (s, 3H) | 26.4 q | 1.17 (s, 3H) | 26.7 q | 1.18 (s, 3H) |
| 10 | 26.7 q | 1.24 (s, 3H) | 27.0 q | 1.17 (s, 3H) | 27.6 q | 1.14 (s, 3H) |