1,3,4-oxadiazoles的内分子二元-老者/1,3-双极循环添加级联
Gregory I Elliott1, James R Fuchs, Brian S J Blagg
1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|August 10, 2006
概括
这项研究详细介绍了涉及1,3,4-oxadiazoles的分子内循环添加反应的系统探索. 这项研究定义了这些多功能 [4 + 2]/[3 + 2] 级联反应的范围和实用性.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
背景情况:
- 1,3,4-oxadiazoles是异环化合物,具有多样化的应用.
- 内分子循环添加反应为复杂的分子架构提供了高效的途径.
研究的目的:
- 系统地探索1,3,4-oxadiazoles的分子内 [4 + 2]/[3 + 2] 循环添加级联.
- 定义这种反应级联的范围和局限性.
- 为了确定这种方法的合成实用性.
主要方法:
- 基质和反应条件的系统变化.
- 使用光谱技术对反应产物的详细分析.
- 对反应效率和选择性的评估.
主要成果:
- 在定义条件下,1,3,4-oxadiazoles的分子内 [4 + 2]/[3 + 2] 循环添加级联在定义条件下有效地进行.
- 广泛的基质被发现与反应相容.
- 级联反应为各种异环基架提供了通道.
结论:
- 1,3,4-oxadiazoles的分子内循环添加级联是一种强大的合成工具.
- 这种方法使得高效率和选择性复杂分子的构建成为可能.
- 定义的范围和实用性突出显示了其在有机合成中的潜力.
相关概念视频
Cycloaddition Reactions: Overview
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.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
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.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Diels–Alder Reaction: Characteristics of Dienes
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
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).
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.

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