Table 2.
1H (500 MHz) and 13C (125 MHz) NMR spectroscopic data for compounds 3a and 3b in DMSO-d6
| Position | 3a | 3b | ||
|---|---|---|---|---|
| δH (J in Hz) | δC | δH (J in Hz) | δC | |
| 1 | 163.8 | 163.8 | ||
| 2 | 108.6 | 108.6 | ||
| 3 | 168.7 | 168.7 | ||
| 4 | 110.0 | 110.0 | ||
| 5 | 161.1 | 161.0 | ||
| 6 | 73.2 | 73.2 | ||
| 7 | 5.79 (1H, s) | 133.5 | 5.77 (1H, s) | 134.1 |
| 8 | 132.9 | 132.9 | ||
| 9 | 3.83 (1H, s) | 87.6 | 3.85 (1H, s) | 87.6 |
| 10 | 135.3 | 135.6 | ||
| 11 | 5.61 (1H, s) | 130.0 | 5.62 (1H, s) | 129.0 |
| 12 | 79.3 | 79.3 | ||
| 13 | 3.57 (1H, s) | 66.2 | 3.58 (1H, s) | 66.3 |
| 14 | 66.9 | 66.9 | ||
| 15 | 3.95 (1H, q, 6.6) | 75.7 | 3.95 (1H, q, 6.6) | 75.7 |
| 16 | 1.92 (3H, s) | 10.0 | 1.92 (3H, s) | 10.0 |
| 17 | 1.98 (3H, s) | 10.3 | 1.97 (3H, s) | 10.3 |
| 18 | 1.50 (3H, s) | 27.2 | 1.51 (3H, s) | 27.3 |
| 19 | 1.20 (3H, s) | 12.3 | 1.21 (3H, s) | 11.8 |
| 20 | 1.58 (3H, s) | 13.4 | 1.59 (3H, s) | 13.8 |
| 21 | 1.20 (3H, s) | 21.9 | 1.20 (3H, s) | 21.9 |
| 22 | 1.35 (3H, s) | 13.2 | 1.35 (3H, s) | 13.4 |
| 23 | 0.99 (3H, d, 6.7) | 18.6 | 0.99 (3H, d, 6.7) | 18.6 |
| 24 | 3.76 (3H, s) | 60.3 | 3.76 (3H, s) | 60.3 |
| 25 | 3.29 (2H, q, 7.0) | 62.7 | 3.30 (2H, q, 7.0) | 62.6 |
| 26 | 1.1 (3H, t, 7.0) | 15.3 | 1.1 (3H, t, 7.0) | 15.2 |
| 6-OH | 5.61 (1H, s) | 5.62 (1H, s) | ||