Table 1.
Comparison of the 1H (mult., J in Hz) and 13C NMR Spectroscopic Data of Compounds 1 and 2 in CD3OD.a,b,c
| position | 1 | 2 | ||
|---|---|---|---|---|
|
| ||||
| δH | δC | δH | δC | |
| 1 | – | 106.8 | – | 106.7 |
| 2 | – | 163.5 | – | 162.6 |
| 3 | 6.17 (d, 2.2) | 95.9 | 6.18 (d, 2.2) | 95.4 |
| 4 | – | 166.8 | – | 166.3 |
| 5 | 5.91 (d, 2.2) | 100.0 | 5.94 (d, 2.2) | 98.1 |
| 6 | – | 169.3 | – | 167.7 |
| 7 | 10.11 (s) | 193.2 | – | 204.8 |
| 1′ | 4.96 (d, 7.4) | 102.1 | 5.02 (d, 7.4) | 102.0 |
| 2′ | 3.50 (t, 7.4) | 74.7 | 3.54 (t, 7.4) | 74.7 |
| 3′ | 3.46 (m) | 78.4 | 3.46 (m) | 78.5 |
| 4′ | 3.41 (m) | 71.1 | 3.42 (m) | 71.1 |
| 5′ | 3.46 (m) | 77.9 | 3.46 (m) | 78.3 |
| 6′ | 3.91, (dd, 12.0, 1.8) | 62.3 | 3.92, (dd, 12.0, 1.8) | 62.4 |
| 3.72, (dd, 12.0, 4.9) | 3.72, (dd, 12.0, 4.9) | |||
| CH3 | – | – | 2.69 (s) | 33.5 |
a
Measured at 400 MHz for 1H NMR with residual signals of CD3OD at δ 3.31 ppm used as reference.
b
Measured at 100 MHz for 13C NMR with residual signals of CD3OD at δ 49.0 ppm used as reference.
c
Assignments supported by 2D NMR experiments.