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相关概念视频

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

9.9K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
9.9K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.6K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.6K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.1K

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Updated: May 30, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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通过循环加法和随后的循环逆转反应进行骨编辑.

Pengwei Xu1, Armido Studer1

  • 1Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany.

Accounts of chemical research
|January 28, 2025
PubMed
概括
此摘要是机器生成的。

骨架编辑通过添加,删除或替换原子来实现精确的分子框架修改. 一种新的循环添加/循环逆转策略允许双原子尺度的操纵,用于药物发现,转化和异.

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科学领域:

  • 合成有机化学 合成有机化学
  • 药品化学 药品化学 是一个
  • 材料科学是一种材料科学.

背景情况:

  • 骨编辑精确地修改了分子框架,这对于药物和材料开发至关重要.
  • 当前的方法往往侧重于单个原子的变化,限制复杂的结构变化.
  • 晚期骨编辑通过避免昂贵的新合成来加速发现.

研究的目的:

  • 通过循环添加/循环逆转来探索骨编辑,用于双原子尺度分子操纵.
  • 为突出最近在激活骨编辑相对惰性基质的进展.
  • 为了展示皮里丁的转化为和纳.

主要方法:

  • 利用循环加法,然后循环逆转来操纵分子框架.
  • 开发一些芳香性过程,以激活皮里丁到氧化皮里丁.
  • 审查涉及四和三等异环的贡献.

主要成果:

  • 证明了双原子转换,正式的单原子转换和原子插入.
  • 实现了高产量的化物转化为和纳.
  • 展示了用于后期阶段应用的和异的相互转换.

结论:

  • 通过循环添加/循环逆转进行骨编辑为分子框架修改提供了一个强大的途径.
  • 这一策略促进了复杂分子的合成,并加速了药物发现.
  • 未来的工作应该专注于基质激活以进行原子结合和环形大小修改.