Phytochemical investigation of the dried leaves of Jasminum officinale var. grandiflorum has led to the isolation of two new secoiridoid glucosides, (2"R)-2"-methoxyoleuropein and (2"S)-2"-methoxyoleuropein, together with four known secoiridoid glucosides, oleuropein, ligstroside, demethyloleuropein and oleoside dimethyl ester, a lignan, (-)-olivil and p-hydroxyphenethyl alcohol. The structures of the new compounds were elucidated from chemical and spectroscopic evidence.
通过对欧鼠李变种(Jasminum officinale var. grandiflorum)的干燥叶片进行植物化学研究,分离出了两种新的仲呋喃糖苷((2 "R)-2"-甲氧基欧鼠李素和(2 "S)-2"-甲氧基欧鼠李素),以及四种已知的仲呋喃糖苷(油菜素、ligstroside、去甲基油菜素和油菜苷二甲酯)、一种木质素、(-)-醇和对羟基苯乙醇。新化合物的结构是通过化学和光谱证据阐明的。
Total synthesis of (+)-pentamethylsalvianolic acid C
作者:Benjamin L. Alford、Helmut M. Hügel
DOI:10.1039/c3ob27478k
日期:——
The totalsynthesis of a methylated analogue of (+)-Salvianolic acidC has been achieved. Key aspects of the synthetic route include an economical Cu(I) acetylide coupling, unique carboxyl activation conditions via microwave irradiation and a novel lipase catalysed kinetic resolution of a racemic mixture of secondary alcohol Danshensu. The preparation of this methylated analogue will not only improve
are endowed with intriguing pharmacological properties as anticancer agents. The synthesis of new polyether derivatives is achieved through ring‐opening polymerization of chiral 2,3‐disubstituted oxiranes, whose absolute configurations define the overall stereochemistry of the produced polymer. The absolutestereochemistry of one of these building blocks, methyl trans‐3‐(3,4‐dimethoxy‐phenyl)glycidate