✍ Scribed by Zhi-Zhi Du; Yue-Mao Shen
No coin nor oath required. For personal study only.
A minor, unprecedented diterpene, 3b,17-dihydroxycleistantha-12,15-dien-2-one (1), was isolated from the CHCl 3 -soluble part of the EtOH extract of the pericarp of Trewia nudiflora. The structure of 1 was elucidated by means of 1D-and 2D-NMR spectroscopic analyses as well as by HR-MS. Also isolated were two known triterpenes, glutin-5-en-3-ol and olean-18-en-3-one (germanicone), as well as three known sterols, (22E,24R)-5a,8a-epidioxyergosta-6,22-dien-3b-ol, (22E,24R)-5a,8a-epidioxyergosta-6,9(11),22-trien-3b-ol, and (22E,24R)-6-methoxyergosta-7,22-dien-3,5-diol.
📜 SIMILAR VOLUMES
## Abstract Three new __ent__‐atisane diterpenes, __i.e.__, 17‐hydroxy‐__ent__‐atisan‐19‐oic acid (**1**), 17‐hydroxy‐__ent__‐atisan‐19‐oic acid methyl ester (**2**), and 16__α__,17‐dihydroxy‐__ent__‐atisan‐19‐al (**3**), together with five known phenolic compounds, __i.e.__, gallic acid, ethyl gal
## Abstract Two new 7‐dehydrobrefeldin A acids, (2__E__,4__R__\*)‐4‐hydroxy‐4‐{(1__R__\*,2__S__\*)‐4‐oxo‐2‐[(1__E__)‐6‐oxohept‐1‐en‐1‐yl]cyclopentyl}but‐2‐enoic acid (**3**) and (2__E__,4__R__\*)‐4‐hydroxy‐4‐{(1__R__\*,2__S__\*)‐2‐[(1__E__,6__S__\*)‐6‐hydroxyhept‐1‐en‐1‐yl]‐4‐oxocyclopentyl}but‐2‐e
Five diterpenoids, including three new ent-trachylobane diterpenoids, i.e., (3a)-3-hydroxy-enttrachylobane-17,19-dioic acid 19-methyl ester (1), ent-trachylobane-17,19-dioic acid 19-methyl ester (2), ent-trachylobane-17,19-dioic acid (3), and two known atisane-type ones, i.e., (16a)-16,17-dihydroxy-