Table 1 13C and 1H NMR spectroscopic data for compounds 1 and 2 in CDCl3
Position | Compound 1 | Compound 2 | ||
|---|---|---|---|---|
δC | δH (J in Hz) | δC | δH (J in Hz) | |
1 | 85.4 | – | 76.5 | – |
2 | 134.4 | 5.62 (1H, d, 5.6) | 58.5 | 3.67 (1H, brsb) |
3 | 140.6 | 6.00 (1H, d, 5.6) | 57.0 | 3.27 (1H, brsb) |
4 | 82.3 | – | 70.0 | – |
5 | 66.3 | 2.51 (1H, d, 11.4) | 44.6 | 2.85 (1H, d, 10.8) |
6 | 78.1 | 4.16 (1H, dd, 8.5, 11.4) | 76.5 | 4.24 (1H, t, 10.0) |
7 | 45.0 | 3.63–3.70 (1H, m) | 48.9 | 3.67–3.77 (1H, m) |
8 | 74.5 | 4.86–4.93 (1H, m) | 71.5a | 5.25 (1H, m) |
9 | 36.4 | 2.90 (1H, dd, 6.0, 12.0) 2.73 (1H, dd, 10.5, 12.0) | 44.0 | 2.41 (1H, dd, 7.1, 16.5) 1.77 (1H, dd, 1.7, 16.5) |
10 | 143.0 | – | 71.2a | – |
11 | 135.5 | – | 137.4 | – |
12 | 169.7a | – | 169.3 | – |
13 | 125.3 | 6.32 (1H, d, 3.4) 5.86 (1H, d, 3.4) | 121.5 | 6.21 (1H, d, 3.1) 5.56 (1H, d, 3.1) |
14 | 117.4 | 5.13 (1H, brs) 4.86 (1H, brs) | 26.6 | 1.10 (3H, s) |
15 | 24.2 | 1.32 (3H, s) | 20.2 | 1.56 (3H, s) |
–OAc (CH3) | 21.1 | 2.14 (3H, s) | 21.3 | 2.13 (3H, s) |
–OAc (–C=O) | 169.9a | – | 170.0 | – |