Taxchinin L

Taxchinin L

Common Name: Taxchinin L

Synonyms: Taxayuntin F

CAS Registry Number:

InChI: InChI=1S/C33H42O12/c1-16-21(37)14-32(30(5,6)40)24(16)25(38)27(44-29(39)20-11-9-8-10-12-20)31(7)22(42-17(2)34)13-23-33(15-41-23,45-19(4)36)26(31)28(32)43-18(3)35/h8-12,21-23,25-28,37-38,40H,13-15H2,1-7H3/t21-,22?,23+,25+,26-,27?,28?,31+,32-,33?/m0/s1

InChIKey: CBTLXSBFAWEYRW-GCEIEVPXSA-N

Formula: C33H42O12

Molecular Weight: 630.2722

Exact Mass: 630.2697

NMR Solvent: CHCl3

MHz: 500 (1H); 125 (13C)

Calibration: TMS

NMR references: Kiyoshi Tanaka, Kaoru Fuji, Toshio Yokoi, Tetsuro Shingu, Bo Li, Handong Sun. Structures of Taxchinins L and M, Two New Diterpenoids from Taxus chinensis var. Mairei. Chemical and Pharmaceutical Bulletin, 1996, Volume 44, Issue 9, Pages 1770-1774. https://doi.org/10.1248/cpb.44.1770

Species: Taxus chinensis var. Marei- collected Septmeber 1990 at Yunnan, China

Notes:

Proton NMR Peaks

Position PPM Peak Type J (Hz)
2 5.95 d 7.3
3 3.15 d 7.4
5 4.94 d 6.2
6α 2.61 ddd 16, 8.8, 6.5
6β 1.81
7 5.46 dd 8.6, 6.5
9 5.97 d 10.1
10 4.69 t 10.3
13 4.45
14α 1.43 dd 15, 6.9
14β 2.13 dd 15.1, 7.6
16 1.02 s
17 1.22 s
18 1.96 s
19 1.73 s
20a 4.53 d 7.4
20b 4.45
10-OH 4.28 d 10.3
15-OH 4.03 brs
2-AcO 2.05 s
4-AcO 2.17 s
7-AcO 1.79 s
9-BzO (2,6) 7.99 d-like
9-BzO (3,5) 7.45 t-like
9-BzO (4) 7.57 t-like

Carbon NMR Peaks

Position PPM
1 66.4
2 68.5
3 43
4 79.4
5 85.4
6 34.4
7 69.9
8 43.4
9 80.8
10 66.7
11 137.5
12 146.1
13 77.5
14 39.3
15 76.3
16 27.3
17 25.1
18 11.4
19 14
20 75