Table 3.
The 13C and 1H NMR data for M1 and leonurine.
| Number | Carbon signalsa,b | Proton signalsa,b | ||
|---|---|---|---|---|
| Leonurine | M1 | Leonurine | M1 | |
| 1 | 157.3 | 159.2 | ||
| 2 | 40.9 | 43.2 | 3.15 (t, 2H, J = 6.65 Hz) | 3.04 (t, 2H, J = 6.65 Hz) |
| 3 | 26.4 | 27.1 | 1.73 (m, 2H) | 1.62 (t, 2H, J = 7.14 Hz) |
| 4 | 26.8 | 27.5 | 1.58 (m, 2H) | 1.52 (quintet, 2H, J = 6.96 Hz) |
| 5 | 63.8 | 68.1 | 4.26 (t, 2H, J = 6.16 Hz) | 4.11 (t, 2H, J = 6.06 Hz) |
| 6 | 166.6 | 170.1 | ||
| 7 | 124.6 | 128.6 | ||
| 8 and 12 | 105.4 | 109.6 | 7.22 (s, 2H) | 7.05 (s, 2H) |
| 9 and 11 | 147.8 | 154.6 | ||
| 10 | 138.9 | 140.0 | ||
| 13 and 14 | 56.6 | 58.7 | 3.82 (s, 6H) | 3.68 (s, 6H) |
| 1′c | 104.7 | 4.99 (d, 1H, J = 7.44 Hz) | ||
| 2′ | 75.9 | 3.36–3.45 (m, 1H) | ||
| 3′ | 79.2 | 3.48 (t, 1H, J = 4.50 Hz) | ||
| 4′ | 74.2 | 3.36–3.45 (m, 1H) | ||
| 5′ | 78.0 | 3.36–3.45 (m, 1H) | ||
| 6′ | 177.5 | |||
aAll spectra were recorded on a Bruker Avance 400 spectrometer, in D2O.
bThe carbon and proton signals were assigned on 1H NMR, 13C NMR, HMBC, and HSQC.
cCarbon number of glucuronic acid moiety.