NMR data for compounds 1 and 2 (400 MHz for 1H, and 100 MHz for 13C)a,b.
| No. | 1 (DMSO-d6) | 2 (DMSO-d6) | ||
|---|---|---|---|---|
| δ H | δ C | δ H | δ C | |
| 1 | 1.70 (m, H-1a) | 36.6 | 1.76 (m, H-1a) | 36.8 |
| 2.21 (m, H-1b) | 2.52 (m, H-1b) | |||
| 2 | 1.28 (m, H-2a) | 28.2 | 2.43 (m, H-2a) | 34.6 |
| 1.62 (m, H-2b) | 2.67 (m, H-2b) | |||
| 3 | 3.08 (br t, 7.2) | 77.0 | 216.1 | |
| 4 | 39.1 | 47.1 | ||
| 5 | 1.18 (dd, 2.2, 12.4) | 49.7 | 1.86 (dd, 2.0, 12.4) | 49.7 |
| 6 | 1.84 (m, H-6a) | 18.8 | 1.72 (m, H-6a) | 19.8 |
| 1.87 (m, H-6b) | 1.82 (m, H-6b) | |||
| 7 | 2.77 (m, H-7a) | 33.7 | 2.81 (m, H-7a) | 33.5 |
| 2.89 (dd, 5.6, 18.2, H-7b) | 2.93 (dd, 5.6, 18.0, H-7b) | |||
| 8 | 154.6 | 154.1 | ||
| 9 | 141.5 | 140.0 | ||
| 10 | 37.1 | 36.6 | ||
| 11 | 7.48 (d, 8.1) | 133.2 | 7.62 (d, 8.2) | 147.0 |
| 12 | 6.94 (d, 8.1) | 121.0 | 7.03 (d, 8.2) | 121.5 |
| 13 | 154.6 | 154.9 | ||
| 16 | 2.33 (s, 3H) | 24.0 | 2.37 (s, 3H) | 23.7 |
| 18 | 0.98 (s, 3H) | 28.7 | 1.08 (s, 3H) | 26.8 |
| 19 | 0.77 (s, 3H) | 16.3 | 1.03 (s, 3H) | 21.3 |
| 20 | 1.07 (s, 3H) | 25.1 | 1.19 (s, 3H) | 24.4 |
| 3-OH | 4.45 (br s) | |||
a
Chemical shift values were in ppm and J values (in Hz) were presented in parentheses.
b
The assignments were based on HMQC, HMBC, and 1H–1H COSY experiments.