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相关概念视频

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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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.
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[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

2.1K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

1.8K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
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铜催化三烯循环通过乙烯酸.

Chen Luo1, Yan-Xin Zheng1, Sheng-Biao Ji1

  • 1Key Laboratory of Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Organic letters
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概括

这项研究介绍了一种催化反应,从三中形成多环. 这种高效的方法在温和的条件下在一个步骤中创建三个环,提供了一条新的合成路线.

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科学领域:

  • 有机化学 有机化学
  • 催化剂是一种催化剂.
  • 合成方法论 合成方法论

背景情况:

  • 循环化反应是有机合成的基础.
  • 醇衍生物是药物化学和材料科学中的重要支架.
  • 构建高效的多环系统仍然是一个挑战.

研究的目的:

  • 开发一种新的铜催化方法,用于合成多环.
  • 通过三元循环实现原子经济和实际合成.
  • 探索非对称合成的机制和潜力.

主要方法:

  • 铜催化三烯的循环发生.
  • 对乙烯基离子中间体的研究.
  • 对反应机制和区域选择性的分析.

主要成果:

  • 有效合成有价值的多环形醇.
  • 在一个步骤中构建三个新环.
  • 温和的反应条件和高原子经济.
  • 展示有序和区域选择性基反应.
  • 有证据表明潜在的不对称循环.

结论:

  • 开发的铜催化循环化是一种有效的通道,用于多循环火.
  • 反应通过一个被提议的有序和区域选择机制进行.
  • 这种方法为复杂的异环合成提供了实用和原子经济的方法.
  • 对不对称催化物的潜力为性醇合成开辟了新的途径.