Tannins of cornaceous plants. I. Cornusiins A, B and C, dimeric monomeric and trimeric hydrolyzable tannins from Cornus officinalis, and orientation of valoneoyl group in related tannins.
Cornusiin A (1), cornusiin B (2) and cornusiin C (3), new dimeric, monomeric and trimeric hydrolyzable tannins, were isolated from the fruits of Cornus officinalis (Cornaceae). Their structures, including the orientation of the valoneoyl group in 1 and 3, were established on the basis of chemical and spectroscopic data. 2,3-Di-O-galloyl-D-glucose (7), 1,2,3-tri-O-galloyl-beta-D-glucose, 1,2,6-tri-O-galloyl-beta-D-glucose, 1,2,3,6-tetra-O-galloyl-beta-D-glucose, gemin D (5), isoterchebin, tellimagrandin I (6) and tellimagrandin II were also isolated from the fruits. The orientation of the valoneoyl group in camptothin A (14) and that in camptothin B (15), which had been isolated from Camptotheca acuminata (Nyssaceae), were also determined based on that in 1.
Hatano
T
T
Ogawa
N
N
Kira
R
R
Yasuhara
T
T
Okuda
T
T
D000972:Antineoplastic Agents, Phytogenic / Q000032:analysis / Q000302:isolation & purification*; D055598:Chemical Phenomena; D002621:Chemistry; D002681:China; D047348:Hydrolyzable Tannins; D007564:Japan; D010946:Plants, Medicinal / Q000737:chemistry*; D018894:Reverse Transcriptase Inhibitors; D013634:Tannins / Q000032:analysis* / Q000302:isolation & purification*
D000972:Antineoplastic Agents, Phytogenic; D047348:Hydrolyzable Tannins; D018894:Reverse Transcriptase Inhibitors; D013634:Tannins; C525521:gemin D; C062124:cornusiin C; C062123:cornusiin A; C062122:cornusiin B