Table 1 1H (500 MHz, J in Hz) and 13C (125 MHz) NMR data for 1 and 2
From: Tyrosinase inhibitory activity of flavonoids from Artocarpus heterophyllous
Position | 1 a | 2 b | ||
|---|---|---|---|---|
δ H | δ C | δ H | δ C | |
2 | 161.7 | 5.44 dd (12.8; 3.0) | 80.4 | |
3 | 6.98 s | 106.8 | 2.70 dd (16.7; 3.0)3.00 dd (16.7; 12.8) | 44.6 |
4 | 182.0 | 191.0 | ||
5 | 158.4 | 7.59 d (8.6) | 126.4 | |
6 | 109.7 | 6.63 d (8.6) | 110.5 | |
7 | 161.7 | 162.4c | ||
8 | 6.51 s | 93.2 | 115.5 | |
9 | 155.3 | 162.1c | ||
10 | 103.3 | 130.9 | ||
1′ | 108.7 | 131.6 | ||
2′ | 158.8 | 7.42 d (8.6) | 128.8 | |
3′ | 6.49 d (2.4) | 103.3 | 6.90 d (8.6) | 116.2 |
4′ | 161.7 | 158.6 | ||
5′ | 6.44 dd (8.8; 2.4) | 108.1 | 6.90 d (8.6) | 116.2 |
6′ | 7.73 d (8.8) | 129.8 | 7.42 d (8.6) | 128.8 |
1″ | 3.30 d (7.2) | 20.8 | 3.38 d (7.3) | 22.4 |
2″ | 5.55 t (7.2) | 126.4 | 5.49 t (7.3) | 122.8 |
3″ | 130.2 | 136.3 | ||
4″ | 4.51 s | 69.0 | 3.87 s | 68.5 |
5″ | 1.79 s | 13.9 | 1.65 s | 13.9 |
1''' | 125.1 | |||
2''', 6''' | 7.53 d (8.7) | 130.4 | ||
3''', 5''' | 6.78 d (8.7) | 115.8 | ||
4''' | 159.9 | |||
7''' | 7.54 d (16.0) | 144.9 | ||
8''' | 6.39 d (16.0) | 114.2 | ||
9''' | 166.5 | |||
5-OH | 13.34 | |||