Table 1.
1H-NMR spectroscopic data (CDCl3) for compounds 1–4.
| Position | 1 | 3 | 4 | 2 a |
|---|---|---|---|---|
| δH Mult. (J in Hz) |
δH Mult. (J in Hz) |
δH Mult. (J in Hz) |
δH Mult. (J in Hz) |
|
| 3 | 5.85 s | |||
| 4 | 4.31 d (2.8) | 5.71 d (3.2) | ||
| 5 | 1.70 m | 1.88 m | ||
| 6 | 2.51 dq (9.6, 6.8) | 2.51 dq (10.8, 7.2) | ||
| 7 | 3.19 d (6.8) | 3.16 d (6.8) | 2.21 m | 2.24 m 1.95 m |
| 8 | 4.92 t (6.8) | 4.91 t (6.8) | 5.14 t (6.8) | 5.09 t (6.8) |
| 10 | 1.90–2.00 m | 1.90–2.00 m | 2.02 m | 2.00 m |
| 11 | 1.97–2.05 m | 1.97–2.05 m | 2.08 t | 2.06 m |
| 12 | 5.04 t (7.2) | 5.03 t (7.2) | 5.08 t (6.4) | 5.09 t (6.8) |
| 14 | 1.90–2.00 m | 1.90–2.00 m | 2.64 d (4.8) | 2.63 d (5.6) |
| 15 | 1.97–2.05 m | 1.97–2.05 m | 5.56 m | 5.57 m |
| 16 | 5.05 t (7.2) | 5.05 t (7.2) | 5.56 m | 5.59 d (5.6) |
| 18 | 1.66 s | 1.65 s | 1.29 s | 1.29 s |
| 19 | 1.56 s | 1.57 s | 1.29 s | 1.29 s |
| 20 | 1.55 s | 1.55 s | 1.55 s | 1.53 s |
| 21 | 1.72 s | 1.72 s | 1.63 s | 1.55 s |
| 22 | 2.02 s | 2.00 s | 1.14 d (7.2) | 1.17 d (7.2) |
| 23 | 3.77 s | 3.97 s | 3.63 s | 3.65 s |
| 24 | 3.96 s | 4.04 s | 3.98 s |
a Acetate group: δ 2.08 (s, OC=OCH3).