Enantioselective total synthesis and absolute stereostructure of hippospongic acid A
摘要:
A compound having the structure proposed for hippospongic acid A, a triterpene that specifically inhibits gastrulation of starfish embryos, was synthesized enantioselectively. The synthetic compound was not identical to the natural product. Comparison of the NMR spectra of the natural and synthetic compounds led us to propose an alternative structure, which was confirmed by enantioselective synthesis. The present synthesis established that the natural product has the (R)-configuration. (C) 2001 Elsevier Science Ltd. All rights reserved.
Development of Aliphatic Alcohols as Nucleophiles for Palladium-Catalyzed DYKAT Reactions: Total Synthesis of (+)-Hippospongic Acid A
作者:Barry M. Trost、Michelle R. Machacek、Hong C. Tsui
DOI:10.1021/ja050340q
日期:2005.5.1
The ability to use aliphatic alcohols as competent nucleophiles in the palladium-catalyzed dynamic kinetic asymmetric transformation of Baylis-Hillman adducts is explored. High yield and enantioselectivity is obtained for both the kinetic transformation and dynamic kinetic transformation. The absolute stereochemistry of the products is used to explore the reactive conformation of 2-substituted pi-allyl
Synthesis of (R)-(+)-Hippospongic Acid A, a Triterpene Isolated from the Marine Sponge, Hippospongia sp.
作者:Miwako ICHIHASHI、Hirosato TAKIKAWA、Kenji MORI
DOI:10.1271/bbb.65.2569
日期:2001.1
Hippospongic acid A (1) is a triterpene metabolite of the marine sponge, Hippospongia sp., with inhibitory activity against the gastrulation of starfish embryos. (R)-(+)-1 was synthesized by employing enzymatic kinetic resolution as the key step.
海马海绵酸 A (1) 是海洋海绵海马海绵的一种三萜类代谢物,对海星胚胎的胃形成具有抑制活性。(R)-(+)-1是通过酶动力学解析这一关键步骤合成的。