Table 2.
1H and 13C NMR data of dichapetalins A and M isolated from D. crassifolium.
| Position | Dichapetalin A (5) |
Dichapetalin M (6) |
||
|---|---|---|---|---|
| δC (ppm) | δH (Mult) | δC (ppm) | δH (Muit) | |
| 1(CH2) | 41.3 | 2.15, s | 39.9 | 2.90,1.65 |
| 2(CH) | 119.3 | 5.45, m | 116.6 | 5.40 |
| 3(C) | 141.2 | - | 141.3 | - |
| 4(C) | 39.5 | - | 39.8 | - |
| 5(CH) | 43.5 | 2.00a | 59.1 | 1.60 |
| 6(CH2) | 24.2 | 1.87,m | 71.3 | 4.60,dd,3.80 |
| 7(CH) | 73.2 | 3.92 (t, J = 1.5) | 213.7 | - |
| 8(C) | 37.4 | - | 47.0 | - |
| 9(CH) | 45.1 | 1.75 (d, J = 2.5) | 52.1 | 2.00 |
| 10(C) | 37.2 | - | 36.9 | - |
| 11(CH) | 124.1 | 5.43 (dd, J = 10, 2.5Hz) | 120.1 | 5.40,dd |
| 12(CH) | 131.1 | 6.25 (dd, J = 10, 3Hz) | 131.6 | 6.35,dd |
| 13(C) | 30.6 | - | 31.6 | - |
| 14(C) | 37.5 | - | 36.5 | - |
| 15(CH2) | 26.2 | 2.04a | 26.7 | 2.00,2.20 |
| 16(CH2) | 23.9 | 1.13, s | 23.6 | 1.30,1.80,m |
| 17(CH) | 41.8 | 2.62, m | 40.5 | 2.55 |
| 18(CH3) | 18.4 | 0.94,s | 17.1 | 1.10 |
| 19(CH3) | 18.6 | - | 18.2 | 1.30,s |
| 20(CH) | 42.6 | 3.30,m | 47.3 | 3.00,dd,2.45 |
| 21(C) | 181.3 | - | 174.0 | - |
| 22(CH2) | 31.4 | 2.37,m | 72.1 | 4.20,dd |
| 23(CH) | 77.1 | 5.26, m | 111.3 | - |
| 24(CH2) | 123.1 | 5.50, s | 45.7 | 2.90,2.50,d |
| 25(C) | 143.2 | - | 85.1 | - |
| 26(CH2) | 67.3 | 3.98,s | 78.5 | 4.35,d,4.10,d |
| 27(CH3) | 14.1 | 1.75, s | 22.0 | 1.70,s |
| 28(CH3) | 24.7 | 1.32, s | 26.5 | 1.55,s |
| 30(CH2) | 16.9 | 0.85 (d, J = 5Hz) | 14.4 | 1.30,d,1.05 |
| 2′ (CH2) | 73.6 | 3.56 (d, J = 10.5Hz) | 71.3 | 4.35,3.95,d |
| 5′ (CH2) | 42.6 | 2.20 (dd, J = 13.5, 4Hz) | 40.1 | 2.70, tbr,2.25 |
| 6′ (CH) | 83.6 | 4.27 (dd, J = 11.5, 2.5Hz) | 81.3 | 4.35,dd |
| 1″(C) | 143.90 | - | 142.5 | - |
| 2″/6″ (CH) | 126.97 | 7.37, m | 128.4 | 7.45,d |
| 3″/5″ (CH) | 129.5 | 7.33, m | 125.7 | 7.40,t |
| 4″ (CH) | 128.5 | 7.26, m | 127.5 | 7.30,t |
| AcCO(C) | 170.4 | - | ||
| AcCH3(CH3) | 21.8 | 2.00,s | ||
a
Overlapping signals.