Synthesis of (+)-altholactone, (+)-7-epi-altholactone, (−)-etharvensin, and (+)-alumheptolide-A using Pd-catalyzed carbonylation
作者:Yuki Miyazawa、Yasunao Hattori、Hidefumi Makabe
DOI:10.1016/j.tetlet.2018.09.062
日期:2018.11
Syntheses of (+)-altholactone isolated from Goniothalamus giganteus and its C-7 epimer (+)-7-epi-altholactone, (−)-etharvensin and (+)-alumheptolide-A were achieved. The lactone ring of these compounds was constructed using Pd-catalyzed carbonylation.
Stereoselective Total Synthesis of Bioactive Styryllactones (+)-Goniofufurone, (+)7-<i>epi</i>-Goniofufurone, (+)-Goniopypyrone, (+)-Goniotriol, (+)-Altholactone, and (−)-Etharvensin
作者:Kavirayani R. Prasad、Shivajirao L. Gholap
DOI:10.1021/jo0702342
日期:2008.1.1
[GRAPHICS]Stereoselective total synthesis of biologically active styryllactones 7-epi-goniofufurone, goniofufurone, goniopypyrone, goniotriol, altholactone, and etharvensin was achieved in high overall yields from a common intermediate derived from D-(-)-tartaric acid. It is based on the utility of a masked tetrol, comprising an alkene tether and four contiguous hydroxy groups. The pivotal reaction sequence involves hydroxy-directed lactonization via the oxidation of alkene, and subsequent elaboration to styryllactones. The masked tetrol was prepared by the extension of gamma-phenyl-gamma-hydroxy butyramide, readily obtained from the bis-dimethylamide of tartaric acid, employing a combination of selective Grignard additions and a stereoselective reduction.
Preparation of 7-Alkoxylated Furanopyrones: Semisynthesis of (−)-Etharvensin, a New Styryl-Lactone from <i>Goniothalamus arvensis</i>
作者:Almudena Bermejo、M. Amparo Blázquez、Angel Serrano、M. Carmen Zafra-Polo、Diego Cortes
DOI:10.1021/np970346w
日期:1997.12.1
A new furanopyrone derivative, (-)-etharvensin (1), was isolated from the stem bark of Goniothalamus arvensis. Semisynthesis of the 7-ethoxyfuranopyrone 1 was achieved by addition of EtOH in concentrated acid medium to the unsaturated alpha-pyrone (+)-altholactone (2). This protocol constitutes a novel, direct (single-step), and efficient method to prepare this class of bioactive compounds.