Synthesis and Stereochemical Confirmation of the Secoiridoid Glucosides Nudiflosides D and A
摘要:
We describe herein an efficient access to the highly substituted cyclopentane unit present in the Nudifloside secoiridoid family via crotyl phosphonamide anion mediated conjugate addition to cyclopentenone.
Synthesis and Stereochemical Confirmation of the Secoiridoid Glucosides Nudiflosides D and A
摘要:
We describe herein an efficient access to the highly substituted cyclopentane unit present in the Nudifloside secoiridoid family via crotyl phosphonamide anion mediated conjugate addition to cyclopentenone.
作者:Weiguo Quan、Binxun Yu、Jiyong Zhang、Qiren Liang、Xuegong She、Xinfu Pan
DOI:10.1016/j.tet.2007.07.053
日期:2007.10
The facile total synthesis of the (−)-Heliconol A (ent-1) as well as its diastereoisomer 18 is described, in which different reaction sequences lead to different results. The osmylation of 15 followed by hydrolysis afforded a single isomer 18, otherwise, a mixture of ent-1 and 18 resulted. Other important processes include the catalytic asymmetric CBS reduction and induced osmylation. The synthesis