Table 1.
1H- and 13C-NMR data for serratiochelin A (1) and C (2) in DMSO-d6.
| NMR Data | Serratiochelin A (1) | Serratiochelin C (2) | ||
|---|---|---|---|---|
| Position | δC, Type | δH (J in Hz) | δC, Type | δH (J in Hz) |
| 1 | 8.30, t (5.9) | 8.01, t (5.9) | ||
| 2 | 169.6, C | 169.73, C | ||
| 3 | 114.9, C | 114.92, C | ||
| 4 | 117.1, CH | 7.25, dd (8.1, 1.5) | 117.04, CH | 7.25, dd (8.2, 1.5) |
| 5 | 117.8, CH | 6.67, t (7.9) | 117.84, CH | 6.66, t (8.0) |
| 6 | 118.7, CH | 6.9, dd (7.8, 1.4) | 118.65, CH | 6.89, dd (7.8, 1.5) |
| 7 | 146.3, C | 146.27, C | ||
| 8 | 149.8, C | 149.81, C | ||
| 9 | 148.3, C | 146.12, C | ||
| 10 | 145.7, C | 148.27, C | ||
| 11 | 119.4, CH | 6.96, dd (7.8, 1.6) | 118.18, CH | 6.92, dd (7.7, 1.5) |
| 12 | 118.7, CH | 6.73, t (7.9) | 117.77, CH | 6.69, t (7.9) |
| 13 | 117.9, CH | 7.07, dd (7.9, 1.6) | 118.92, CH | 7.37, dd (8.1, 1.6) |
| 14 | 110.3, C | 116.77, C | ||
| 15 | 165.7, C | 168.01, C | ||
| 16 | 8.66, s | |||
| 17 | 73.7, CH | 4.45, d (87.3) | 59.18, CH | 4.34, dd (8.0, 4.4) |
| 18 | 78.8, CH | 4.86, p (6.4) | 66.38, CH | 4.10, qd (6.1, 4.7) |
| 19 | 20.7, CH3 | 1.45, d (6.3) | 20.30, CH3 | 1.09, d (6.4) |
| 20 | 169.8, C | 169.99, CH | ||
| 21 | 8.81, s | 8.78, t (5.3) | ||
| 22 | 36.7, CH2 | 3.30, m | 36.58, CH2 | 3.29, q (6.7) |
| 23 | 28.9, CH2 | 1.72, p (7.0) | 28.96, CH2 | 1.67, p (7.0) |
| 24 | 36.6, CH2 | 3.18, m | 36.41, CH2 | 3.20–3.08, m |
The structure of serratiochelin C (2) was confirmed in a similar manner to that of 1. All NMR spectra can be seen in the Supplementary Material (Figures S6–S10).