Table 1. 1H NMR Spectroscopic Data (δ in ppm, J in Hz) of Compounds 1–5 in CD3OD.
| position | GB (1) | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| 1α | 4.19 (d, 7.8) | 4.56 (d, 7.8) | 4.44 (s) | 2.67 (d, 16.2) | 4.51 (s) |
| 1β | 2.74 (dd, 16.2, 4.8) | ||||
| 2 | 4.58 (d, 7.8) | 4.49 (d, 7.8) | 4.01 (s) | 4.01 (d, 4.8) | |
| 3 | 2.35 (d, 9.6) | ||||
| 6 | 5.40 (d, 4.2) | 5.34 (d, 5.4) | 5.54 (d, 6.0) | 4.70 (d, 5.4) | 5.35 (d, 5.4) |
| 7α | 2.12 (dt, 13.8, 5.1) | 2.34 (dt, 13.8, 5.3) | 2.39 (dt, 13.8, 6.0) | 2.44 (dt, 13.8, 5.5) | 2.28 (dt, 13.8, 5.3) |
| 7β | 2.27 (dd, 13.8, 4.8) | 1.91(dd, 13.8, 4.8) | 1.90 (dd, 13.8, 6.0) | 1.86 (dd, 13.8, 6.0) | 1.86 (dd, 13.8, 4.8) |
| 8 | 1.92 (dd, 13.8, 4.8) | 1.78 (dd, 13.8, 4.8) | 1.84 (dd, 6.0, 1.0) | 1.86 (dd, 13.8, 6.0) | 1.81 (dd, 13.8, 4.8) |
| 10 | 5.10 (s) | 4.83 (s) | 4.74 (s) | 4.73 (s) | 4.82 (s) |
| 12 | 6.08 (s) | 5.89 (s) | 5.67 (s) | 5.67 (s) | 5.88 (s) |
| 14 | 3.04 (m) | 3.91 (m) | 3.10 (m) | 3.10 (m) | 3.42 (m) |
| 16 | 1.23 (d, 7.2) | 1.22 (d, 7.2) | 1.44 (d, 7.2) | 1.45 (d, 7.2) | 1.22 (d, 7.8) |
| 18–20 | 1.11 (s) | 1.08 (s) | 108 (s) | 1.09 (s) | 1.09 (s) |
| 1′ | 3.18 (m) | 3.21 (m) | 3.20 (m) | 3.25 (m) | |
| 2′ | 1.54 (m) | 1.57 (m) | 1.56 (m) | 1.67 (m) | |
| 3′ | 0.93 (t, 7.2) | 0.93(t, 7.2) | 0.96(t, 7.8) | 0.93(t, 7.2) | |
| 1″ | 3.18 (m) | 3.10 (m) | 3.15 (m) | ||
| 2″ | 1.53 (m) | 1.54 (m) | 1.50 (m) | ||
| 3″ | 0.91 (t, 7.2) | 0.94 (t, 7.8) | 0.88 (t, 7.2) |