(-)-Olivil、(+)-Cycloolivil、(-)-Alashinols F 和 G、(+)-Cephafortin A 及其同系物的全合成和立体化学确认:填补生物合成空白。
摘要:
我们首次描述了使用化学酶法和仿生方法相结合,从共同前体中立体控制全合成 olivil、头孢福汀 A、4-des-O-甲基-4-O-鼠李糖基头孢福汀 A 和 alashinol F。在三个邻位立体碳原子上系统地引入官能团。我们修改了之前指定的 (+)-头孢福汀 A 的立体化学,将其报告为对映体。天然和非自然同系物提供了对该家族成员的生物遗传相互关系的见解。
(-)-Olivil、(+)-Cycloolivil、(-)-Alashinols F 和 G、(+)-Cephafortin A 及其同系物的全合成和立体化学确认:填补生物合成空白。
摘要:
我们首次描述了使用化学酶法和仿生方法相结合,从共同前体中立体控制全合成 olivil、头孢福汀 A、4-des-O-甲基-4-O-鼠李糖基头孢福汀 A 和 alashinol F。在三个邻位立体碳原子上系统地引入官能团。我们修改了之前指定的 (+)-头孢福汀 A 的立体化学,将其报告为对映体。天然和非自然同系物提供了对该家族成员的生物遗传相互关系的见解。
The constituents of Eucommia ulmoides OLIV. II. Isolation and structures of three new lignan glycosides.
作者:TAKESHI DEYAMA、TAKAKO IKAWA、SANSEI NISHIBE
DOI:10.1248/cpb.33.3651
日期:——
Three new lignan glycosides were isolated from the bark of Eucommia ulmoides OLIV. (Eucommiaceae). Their structures were established as (-)-olivil 4', 4"-di-O-β-D-glucopyranoside (1), (+)-1-hydroxypinoresinol 4', 4"-di-O-β-D-glucopyranoside (2) and (+)-medioresinol 4'-O-β-D-glucopyranoside (named eucommin A) (3), based on chemical evidence and spectroscopic studies. A known lignan glycoside, (+)-syringaresinol O-β-D-glucopyranoside (4) was also isolated.
(−)-Olivil and (+)-1-Acetoxypinoresinol from the Olive Tree (<i>Olea europaea</i>L<scp>INNE</scp>; Oleaceae) as Feeding Stimulants of the Olive Weevil (<i>Dyscerus perforatus</i>)
Guided by a feeding stimulant activity test on the olive weevil (Dyscerus perforatus), two compounds that showed potent feeding stimulant activity were isolated from the olive tree (Olea europaea). Based on their spectral data and a literature survey, they were identified as (−)-olivil (1) and (+)-1-acetoxypinoresinol (2). The activities of these minor lignans were significantly higher for the female than for the male weevil.
Secoiridoid Glycosides from the Twigs of <i>Ligustrum obtusifolium</i> Possess Anti-inflammatory and Neuroprotective Effects
作者:Won Se Suh、Oh Kil Kwon、Tae Hyun Lee、Lalita Subedi、Sun Yeou Kim、Kang Ro Lee
DOI:10.1248/cpb.c17-00720
日期:——
new secoiridoid glycosides, obtusifolisides A and B (1, 2), together with 7 known secoiridoid glycosides (3-9) were isolated from the twigs of Ligustrum obtusifolium. The chemical structures of new compounds were determined by a spectroscopic data analysis, including one and two dimensional (1D-, 2D)-NMR, High resolution-MS, and experiments involving chemical reactions. The isolated secoiridoid glycosides
A composition is prepared by extracting phytochemicals from plant matter. This composition is enriched preferably in isoflavones, lignans, saponins, catechins and phenolic acids. Soy is the preferred source of these chemicals; however, other plants may also be used, such as red clover, kudzu, flax, and cocoa. The composition is a dietary supplement for treatment of various cancers, pre- and post-menstrual syndromes, and various other disorders.
A composition is prepared by extracting phytochemicals from plant matter. This composition is enriched preferably in isoflavones, lignans, saponins, catechins and phenolic acids. Soy is the preferred source of these chemicals; however, other plants may also be used, such as red clover, kudzu, flax, and cocoa. The composition is a dietary supplement for treatment of various cancers, pre- and post-menstrual syndromes, and various other disorders.