Expanding the Scope of the Gold(I)-Catalyzed Rautenstrauch Rearrangement: Protic Additives
作者:Cédric Bürki、Andrew Whyte、Sebastian Arndt、A. Stephen K. Hashmi、Mark Lautens
DOI:10.1021/acs.orglett.6b02505
日期:2016.10.7
The synthesis of substituted 2-cyclopentenones using a commercially available gold(I) catalyst is described under flexible reaction conditions. During the course of our investigations, we discovered that using a proton source as an additive is required to obtain the desired substituted cyclopentenones in good yields.
highly selective aldol fragment coupling whose stereochemical outcome is influenced by a gamma-stereogenic methyl group, and an interesting one-pot desilylation/dihydropyranone fragmentation/amidation sequence. As such, saliniketalB was obtained in 11 steps and 23% overall yield from commercially available starting material via a convergent coupling of two equally complex fragments assembled in seven
我们报告了海洋放线菌衍生的天然产物盐缩酮 B 的简洁、对映选择性和高效合成。 . 我们的策略强调了我们实验室开发的 Pt(II) 介导的炔二醇环异构化的效用,以构建二氧杂双环 [3.2.1] 辛烷环系统,这是一种高度选择性的醛醇片段偶联,其立体化学结果受伽马立体甲基的影响,以及有趣的一锅脱甲硅烷基化/二氢吡喃酮片段化/酰胺化序列。像这样,
Cynaropicrin is a guaianolide sesquiterpene lactone, which has potent in vitro and in vivo inhibitory activity against Trypanosoma brucei, the protozoan parasite that causes human African trypanosomiasis (HAT; sleeping sickness). Herein, we describe the synthesis of cynaropicrin's deuterated derivative, cynaropicrin-d(4), by the replacement of the side chain of natural cynaropicrin. The synthesized cynaropicrin-d(4) could be employed as an internal standard for liquid chromatography-mass spectrometry (LC-MS) analysis, in the pharmacokinetic study of cynaropicrin. This could potentially advance the study of this therapeutic lead. (C) 2015 Elsevier Ltd. All rights reserved.