Table 1.
NMR (1H, 13C, HMBC) characteristics of the resulting product
| Position | δC | δH | HMBC |
|---|---|---|---|
| 2 | 83.02; 83.28 (CH) | 4.85 (2H, m) | C-2, C-3, C-1′, C-2′, C-6′ |
| 3α | 71.87; 71.97 (CH) | 4.34 (2H, m) | C-2, C-3, C-1′ |
| 4 | 196.91;196.09 (C=O) | – | – |
| HCCOO− | 68.49 (CH) | 5.11 (1H, s) | HCCOO−, C-4a, C-7, C-8a, COO− |
| 4a | 108.48 | – | – |
| 5 | 161.76;161.87 (C) | 12.11 (s, OH) | – |
| 6 | 97.63; 97.48 (CH) | 5.57 (1H, s) | C-4a, C-6, C-7 |
| 7 | 163.18 (C) | 12.80 (s, OH) | – |
| 8 | 98.71; 98.51 (CH) | 5.63 (1H, s) | C-4a, C-8 |
| 8a | 160.11; 160.25 (C) | – | – |
| 1′ | 128.92 (C) | – | – |
| 2′ | 115.58; 115.66 (CH) | 6.72 (2H, m) | C-2, C-1′, C-2′, C-3′ |
| 3′ | 145.39 (C) | 9.00 (br s, OH) | – |
| 4′ | 146.10; 146.17 (C) | 9.00 (br s, OH) | – |
| 5′ | 115.71; 115.79 (CH) | 6.75 (2H, m) | C-4′, C-5′, C-6′ |
| 6′ | 119.52; 119.70 (CH) | 6.88 (2H, m) | C-4′ |
| COO− | 176.35; 173.40 (COO−) | – | – |