Table 1 NMR spectroscopic data (500 MHz, MeOD) for compound 3 (δ in ppm)
Position | δC | δH, multiplicity (J in Hz) | HSQC | HMBC |
|---|---|---|---|---|
1 | 107.7 | - | - | - |
2 | 120.4 | 8.04, d (7.0) | C-2, H-2 | C-β, C-4 |
3 | 111.1 | 7.35, d (8.0) | C-3, H-3 | C-2, C-5 |
4 | 136.5 | - | - | - |
5 | 125.9 | - | - | - |
6 | 131.4 | 7.85, s | C-6, H-6 | C-1, C-5, C-4 |
1’ | 124 | - | - | - |
2’ | 131 | 7.78, d (8.0) | C-2’, H-2’ | C-3’, C-4’ |
3’ | 113.9 | 6.72, d (8.5) | C-3’, H-3’ | C-1’, C-4’ |
4’ | 160.6 | - | - | - |
5’ | 113.9 | 6.72, d (8.5) | C-5’, H-5’ | C-1’, C-4’ |
6’ | 131.9 | 7.78, d (8.0) | C-6’, H-6’ | C-5’, C-4’ |
C = O | 168.1 | - | - | - |
α | 120.5 | 7.09, d (7.5) | C-α, H-α | C-2, C-5 |
β | 121.7 | 7.10, d (7.5) | C-β, H-β | C-3, C-4 |