TABLE 2.
1H and 13C NMR data of compounds 4–6.
| No. | 4a | 5a | 6a | |||
| δC, type | δH (J in Hz) | δC, type | δH (J in Hz) | δC, type | δH (J in Hz) | |
| 2 | 177.3, C | 177.4, C | 177.4, C | |||
| 3 | 80.8, C | 80.8, C | 80.8, C | |||
| 4 | 77.9, CH | 4.12, d (6.5) | 78.0, CH | 4.12, d (6.5) | 78.0, CH | 4.12, d (6.5) |
| 5 | 61.2, CH | 3.38, ddd (6.5, 5.8, 3.2) | 61.2, CH | 3.38, ddd (6.5, 5.8, 3.3) | 61.2, CH | 3.38, ddd (6.5, 5.8, 3.2) |
| 6 | 62.9, CH2 | 3.76, dd (11.5, 3.2) 3.52, dd (11.5, 5.8) | 63.0, CH2 | 3.76, dd (11.6, 3.3) 3.52, dd (11.6, 5.8) | 63.0, CH2 | 3.76, dd (11.5, 3.2) 3.52, dd (11.5, 5.8) |
| 7 | 74.5, CH | 4.43, d (7.1) | 74.6, CH | 4.43, d (7.1) | 74.5, CH | 4.43, d (7.0) |
| 8 | 129.6, CH | 5.82, dd (15.3, 7.1) | 129.6, CH | 5.82, dd (15.3, 7.1) | 129.7, CH | 5.82, dd (15.3, 7.0) |
| 9 | 134.6, CH | 6.32, dd (15.3, 10.5) | 134.6, CH | 6.32, dd (15.3, 10.5) | 134.6, CH | 6.32, dd (15.3, 10.5) |
| 10 | 131.2, CH | 6.07, dd (15.0, 10.5) | 131.2, CH | 6.07, dd (15.0, 10.5) | 131.2, CH | 6.07, dd (15.0, 10.5) |
| 11 | 136.3, CH | 5.70, dt (15.0, 7.3) | 136.3, CH | 5.70, dt (15.0, 7.3) | 136.3, CH | 5.70, dt (15.0, 7.3) |
| 12 | 33.7, CH2 | 2.08, q (7.3) | 33.7, CH2 | 2.09, q (7.3) | 33.7, CH2 | 2.08, q (7.3) |
| 13 | 30.4, CH2 | 1.39, m | 30.4, CH2 | 1.40, m | 30.3, CH2 | 1.39, m |
| 14 | 30.7, CH2 | 1.31, m | 30.8, CH2 | 1.33, m | 30.6, CH2 | 1.31, m |
| 15 | 30.6, CH2 | 1.31, m | 30.5, CH2 | 1.33, m | 30.5, CH2 | 1.31, m |
| 16 | 30.2, CH2 | 1.31, m | 30.2, CH2 | 1.33, m | 30.4, CH2 | 1.31, m |
| 17 | 26.9, CH2 | 1.40, m 1.33, m | 26.7, CH2 | 1.48, m 1.34, m | 30.2, CH2 | 1.31, m |
| 18 | 40.2, CH2 | 1.44, m 1.40, m | 34.4, CH2 | 1.49, m 1.36, m | 27.0, CH2 | 1.35, m |
| 19 | 68.6, CH | 3.70, m | 73.3, CH | 3.56, m | 29.7, CH2 | 1.62, m |
| 20 | 23.5, CH3 | 1.14, d (6.2) | 67.4, CH2 | 3.46, dd (11.2, 4.5) 3.41, dd (11.2, 6.5) | 65.7, CH2 | 4.05, t (6.7) |
| 20-OAc | 20.8, CH3 173.1, C | 2.02, s |
aRecorded at 600 (1H) and 150 MHz (13C) in CD3OD.