Table 2.
1H- and 13C-NMR spectroscopic data of the two diastereoisomers (1a and 1b).
| Position | 1a | 1b | ||||
|---|---|---|---|---|---|---|
| δH | Multiplicity J (Hz) | δC | δH | Multiplicity J (Hz) | δC | |
| 2 | - | - | 160.99 | - | - | 161.51 |
| 3 | 6.17 | d (9.6) | 111.64 | 6.20 | d (9.6) | 112.26 |
| 4 | 7.57 | d (9.6) | 143.28 | 7.56 | d (9.6) | 143.78 |
| 5 | 7.19 | s | 122.76 | 7.14 | s | 123.20 |
| 6 | - | - | 124.04 | - | - | 124.50 |
| 7 | - | - | 162,89 | - | - | 163.44 |
| 8 | 6.69 | s | 97.26 | 6.76 | s | 97.84 |
| 4-a | - | - | 112.11 | - | - | 112.21 |
| 8-a | - | - | 155.18 | - | - | 155.75 |
| 2' | 5.02 | t (9) | 88.67 | 5.12 | m | 88.91 |
| 3'-a | 3.10–3.30 | m | 3.10–3.30 | m | ||
| 3'-b | 3.10–3.30 | m | 29.06 | 3.10–3.30 | m | 29.61 |
| 4' | - | - | 81.49 | - | - | 82.04 |
| 5' | 1.58 | s | 20.94 | 1.37 | s | 20.58 |
| 1.59 | s | 21.73 | 1.39 | s | 21.47 | |
| 1'' | - | - | 166.57 | - | - | 168.67 |
| 2'' | - | - | 128.11 | - | - | 127.33 |
| 3'' | 5.95 | qq (7.2; 1.5) | 137.28 | 6.09 | qq (7.2; 1.2) | 137.74 |
| 4'' | 1.63 | m | 19.56 | 1.63 | m | 20.09 |
| 5'' | 1.87 | m | 15.13 | 1.85 | m | 15.64 |