Table 2.
1H and 13C NMR (500 and 125 MHz, 300 K) assignments of the C-19 glycosides of compound (1) in pyridine-d5.
| Sugar | Atom No. | 13C NMR | 1H NMR |
|---|---|---|---|
| Glc I | 1 | 95.3 | 6.40 d (8.2) |
| 2 | 77.2 | 4.51 m | |
| 3 | 89.0 | 5.11 m | |
| 4 | 70.5 or 70.6 or 70.7 | 4.20 m | |
| 5 | 78.9 | 4.14 m | |
| 6 | 62.2 | 4.20 m, 4.32 m | |
| Glc V | 1 | 104.6 | 5.80 d (7.4) |
| 2 | 75.8 | 4.19 m | |
| 3 | 78.0–78.5 ¥ | 4.20 m | |
| 4 | 71.5 or 71.6 or 72.1 | 4.11 m | |
| 5 | 78.0–78.5 ¥ | 3.90 m | |
| 6 | 64.4 | 4.33 m, 4.63 m | |
| Glc VI | 1 | 104.6 | 5.29 d (7.9) |
| 2 | 75.9 | 3.95 m | |
| 3 | 78.0–78.5 ¥ | 4.35 m | |
| 4 | 71.5 or 71.6 | 4.09 m | |
| 5 | 78.0–78.5 ¥ | 3.86 m | |
| 6 | 62.2–63.4 ¥ | 4.10 m or 4.36 m, 4.30 m |
¥ Chemical shifts could not be unequivocally assigned due to very close chemical shifts or overlapping resonances.