TABLE 1.
1H and 13C NMR data (δ, in ppm) for compounds 1 and 2a, 2b.
| Position | 1 | 2a (major) | 2b (minor) | |||
|---|---|---|---|---|---|---|
| δC, type | δH, mult. (J in Hz) | δC, type | δH, mult. (J in Hz) | δC, type | δH, mult. (J in Hz) | |
| 1a | 31.9, CH2 | 1.65, m | 31.9, CH2 | 1.67, m | – | – |
| 1b | – | 1.37, m | – | 1.39, m | – | |
| 2a | 30.2, CH2 | 1.73, m | 30.2, CH2 | 1.75, m | – | – |
| 2b | – | 1.29, m | – | 1.30, m | – | |
| 3 | 76.4, CH | 4.01, m | 76.2, CH | 4.01, dd (11.6, 4.0) | – | – |
| 4 | 55.8, Ca | -- | 55.3, C | -- | – | – |
| 5 | 43.3, CH | 2.13, m | 43.4, CH | 2.13, dd (13.2, 3.7) | – | – |
| 6a | 33.3, CH2 | 1.45, m | 33.3, CH2 | 1.41, m | – | – |
| 6b | – | 1.11, m | – | 1.14, m | – | |
| 7 | 70.7, CH | 3.53, brs | 70.5, CH | 3.53, brs | – | – |
| 8 | 54.5, CH | 1.73, m | 54.5, CH | 1.74, m | – | – |
| 9 | 29.3, C | -- | 29.2, C | -- | – | – |
| 10 | 21.3, C | -- | 21.4, C | -- | – | – |
| 11a | 28.1, CH2 | 1.78, m | 28.1, CH2 | 1.78, m | – | – |
| 11b | – | 1.43, m | – | 1.46, m | – | |
| 12 | 33.9, CH2 | 1.60, m | 33.6, CH2 | 1.60, m | – | – |
| 13 | 46.7, C | -- | 46.7, C | -- | – | – |
| 14 | 49.9, C | -- | 49.8, C | -- | – | – |
| 15a | 36.9, CH2 | 1.59, m | 37.0, CH2 | 1.59, m | – | – |
| 15b | – | 1.46, m | – | 1.47, m | – | |
| 16a | 29.2, CH2 | 1.30, m | 29.1, CH2 | 1.95, m | – | – |
| 16b | – | 1.30, m | – | 1.33, m | ||
| 17 | 52.8, CH | 1.56, m | 52.5, CH | 1.56, m | – | – |
| 18 | 17.2, CH3 | 1.00, s | 17.3, CH3 | 1.02, s | – | – |
| 19a | 27.1, CH2 | 0.80, d (4.5) | 27.5, CH2 | 0.80, d (4.7) | – | – |
| 19b | – | 0.30, d (4.4) | – | 0.30, d (4.6) | – | |
| 20 | 37.4, CH | 1.42, m | 37.7, CH | 1.51, m | – | – |
| 21 | 19.0, CH3 | 0.90, d (6.4) | 19.0, CH3 | 0.90, d (6.4) | – | – |
| 22a | 33.7, CH2 | 1.60, m | 40.5, CH2 | 2.21, m | – | – |
| 22b | – | 1.60, m | – | 1.81, m | – | – |
| 23a | 28.7, CH2 | 1.89, m | 129.7, CH | 5.62, ddd (16.0, 7.8, 2.6) | – | – |
| 23b | – | 1.31, m | – | – | – | – |
| 24 | 90.9, CH | 4.16, dd (6.8, 6.8) | 137.1, CH | 5.57, d (16.0) | 91.0, CH | 4.17, dd (6.8, 6.8) |
| 25 | 146.1, C | -- | 82.5, C | -- | 145.7, C | -- |
| 26a | 114.0, CH2 | 4.93, dq (1.6, 1.6) | 24.9, CH3 | 1.29, s | 114.4, CH2 | 4.94, dq (1.6, 1.6) |
| 26b | – | 4.91, m | – | – | – | 4.91, m |
| 27 | 17.1, CH3 | 1.71, s | 25.1, CH3 | 1.29, s | 16.8, CH3 | 1.71, s |
| 28 | 182.6, C a | -- | 180.9, C | -- | – | – |
| 29 | 10.3, CH3 | 1.10, s | 9.8, CH3 | 1.10, s | – | – |
| 30 | 19.2, CH3 | 0.95, s | 19.2, CH3 | 0.94, s | – | – |
a
δC determined by 2D experiments.