相关实验视频

Updated: Oct 6, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

斯卡布罗利德A和B的总合成

Zhanchao Meng¹, Alois Fürstner¹

¹Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany.

Journal of the American Chemical Society

|January 19, 2022

概括

研究人员通过异构化斯卡布罗利德B合成了海洋天然产物斯卡布罗利德A. 这项研究揭示了合成多环状体的关键步骤,包括新型碳循环核心结构.

科学领域:

海洋天然产品化学
有机合成
生物合成研究

背景情况:

像斯卡布罗利德这样的海洋天然产物是具有潜在生物活动的复杂多环状体.
了解这些化合物的生物合成对于它们的有效合成和类型的发现至关重要.

研究的目的:

合成一种海洋天然产物,
通过探索斯卡布罗利德B的作用来研究多环性诺克布拉诺的生物合成.
开发新的合成策略来构建复杂的碳循环核.

主要方法:

一个vinylogous 1,4-diketone的异构化,以获得scabrolide A.
关键的合成步骤包括[2,3]-sigmatropic的酸硫化物重新排列,形成C12-C13键.
采用环闭转移 (RCM) 来构建中央六个环.
使用氧导向的环氧化/环氧开放/异构化序列来确定1,4-二碳基基因和立体化学.

主要成果:

通过斯卡布罗利德B前体的异构化成功合成了斯卡布罗利德A.
合成的scabrolide B被发现与命名的天然产品不同.
合成途径有效地构建了目标分子的固体阻碍碳循环核心.

结论:

这项研究提供了一个可行的合成途径,用于甲基和相关的多循环甲基.
这些发现揭示了潜在的生物合成途径,确定了1,4-二甲的异构化作为关键步骤.
开发的合成方法,包括重组和RCM,对于访问复杂的循环结构非常有价值.

更多相关视频

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Published on: June 13, 2022

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

相关概念视频

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic Aromatic Substitution: Addition–Elimination (S_NAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...