C30H46O3, M 454 Open image in new window
Taxonomy: Cycloartane Triterpenoids
Lansium domesticum (Meliaceae) [1].
Mp 185–186°C, [α]D12 +18.7° (c 1.16, CHCl3).
IR νmax, cm−1: 3200, 1710.
1H NMR (CDCl3, δ, 0-TMS): 0.50 and 0.79 (2H-19, d, J = 4.3 Hz), 0.90, 1.06, 1.08, 1.08, 1.57, 1.67 (6 × CH3, s), 5.81 (H-24, t, J = 7.3 Hz).
The correct structure was finally derived by a single crystal x-ray diffraction study.
Table 1
δC(CDCl3) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
C-1 |
33.3 |
C-7 |
32.6 |
C-13 |
48.6 |
C-19 |
29.4 |
C-25 |
132.9 |
2 |
37.4 |
8 |
47.5 |
14 |
45.2 |
20 |
48.2 |
26 |
25.7 |
3 |
218.5 |
9 |
21.0 |
15 |
34.9 |
21 |
182.6 |
27 |
17.7 |
4 |
50.2 |
10 |
26.1 |
16 |
26.0 |
22 |
25.7 |
28 |
19.3 |
5 |
47.7 |
11 |
26.6 |
17 |
49.1 |
23 |
27.2 |
29 |
22.2 |
6 |
21.3 |
12 |
29.9 |
18 |
17.8 |
24 |
123.6 |
30 |
20.8 |
References
- 1.M. Nishizawa, M. Emura, H. Yamada, M.S. Chairul, Y. Hayashi, H. Tokuda, Tetrahedron Lett. 30(41), 5615–5618 (1989)CrossRefGoogle Scholar
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© Springer Science+Business Media New York 2013