Table 2.
1H- and 13C-NMR spectroscopic data of compounds 4 and 5 (δ in ppm, pyridine-d5, 500 MHz, and 125 MHz).
| Position a | 4 | 5 | ||
|---|---|---|---|---|
| δC | δH b | δC | δ H b | |
| 2 | 107.6 | 107.20 | ||
| 3 | 42.4 | 3.66 q (14.0) | 41.72 | 3.64 overlapped |
| 4 | 194.3 | 195.08 | ||
| 5 | 160.6 | 159.37/159.45 | ||
| 6 | 94.8 | 6.12 d (1.5) | 93.84/82.78 | 6.14 d (2.0)/6.25 d (2.0) |
| 7 | 173.5 | 101.42/101.56 | ||
| 8 | 92.7 | 6.49 d (1.5) | 92.20/92.58 | 6.81 d (2.0)/6.76 d (2.0) |
| 9 | 174.2 | 173.34/173.19 | ||
| 10 | 102.1 | 168.40/168.46 | ||
| 1′ | 126.1 | 125.11 | ||
| 2′/6′ | 132.9 | 7.57 d (8.5) | 132.38 | 7.54 d (8.5)/7.51 d (8.5) |
| 3′/5′ | 116.2 | 7.05 d (8.5) | 115.71/115.68 | 7.06 d (8.5)/7.04 d (8.5) |
| 4′ | 158.1 | 157.68 | ||
| Glc-1″ | 104.48/104.53 | 5.68 d (7.5)/5.62 d (7.5) | ||
| Glc-2″ | 74.57 | 4.34 overlapped | ||
| Glc-3″ | 78.25 | 4.34 overlapped | ||
| Glc-4″ | 70.85/70.92 | 4.34 overlapped | ||
| Glc-5″ | 78.91/78.98 | 4.10 m | ||
| Glc-6″ | 61.96/62.01 | 4.34 overlapped/4.52 m | ||
| 3′-OMe | 55.7 | 3.56 s | 55.48/55.54 | 3.55 s/3.60 s |
a All assignments were based on COSY, HSQC, and HMBC results. b δH Multi (J in Hz).