相关实验视频
Updated: Sep 10, 2025

07:11
Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
Published on: September 28, 2022
2.8K
不对称的勒普托斯C的总合成
Lantian Sun1, Chenshan Lian2, Jingyi Zhao1
1Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong SAR 999077, China.
Organic letters
|August 26, 2025
概括
研究人员实现了简洁的素C总合成. 这涉及新的Hajos-Parrish-Eder-Sauer-Wiechert和Pauson-Khand反应来构建复杂的环系统.
科学领域:
- 有机化学
- 合成化学
- 自然产品合成
背景情况:
- 莱普托斯C是一种复杂的天然产品,具有潜在的生物学意义.
- 有效的合成途径对于获取和研究这些分子至关重要.
研究的目的:
- 开发一个简洁和选择性全合成莱普托斯C.
- 展示新合成方法的实用性.
主要方法:
- 对于AB环结构的选性Hajos-Parrish-Eder-Sauer-Wiechert (HPESW) 反应
- 包括四级碳在内的CD环系统的形成.
主要成果:
- 成功构建了具有高 stereoselectivity (dr = 19:1) 和 enantioselectivity (90% ee) 的 AB 环系统.
- 具有四元碳在C14的CD环系统的有效建立.
- 总的来说,简洁的和对乳素C (1) 的选择性总合成,获得了76%的产量.
结论:
- 开发的合成策略提供了一条有效的路径.
- 这项研究突显了将HPESW和PK反应结合在复杂分子合成中的力量.
相关概念视频
Preparation and Reactions of Sulfides
5.1K
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.
5.1K
SN2 Reaction: Stereochemistry
9.9K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.9K

