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通过Photoredox/PPh3双催化,对2-Isocyanobiaryls进行氧中性循环
Xiaoting Wu1, Pu Chen1, Mengran Gan1
1Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, China.
Organic letters
|December 15, 2023
概括
一种新方法使用光氧催化和三酸 (PPh3) 来制造多种类型的氨酸衍生物. 这种高效的室温合成为寻找复杂分子的有机化学家提供了宝贵的工具.
科学领域:
- 有机化学 有机化学
- 合成方法论 合成方法论
- 催化剂是一种催化剂.
背景情况:
- 南胺衍生物是药物化学和材料科学中的重要支架.
- 有效和有选择的合成路径到功能化的丁胺是非常受欢迎的.
- 现有的方法可能缺乏通用性或需要严苛的条件.
研究的目的:
- 开发一种新,高效和选择性的方法来合成功能组丰富的氨酸衍生物.
- 在循环反应中使用光电还原催化与三酸 (PPh3) 结合使用.
- 探索开发的合成策略的范围和局限性.
主要方法:
- 通过光氧/PPh3介导的2 - 异酸基的循环化.
- 室温反应条件. 在室温反应条件.
- 机械研究,包括激素中间体和键裂解通路.
主要成果:
- 成功合成了大量功能组丰富的氨酸衍生物.
- 在循环化过程中表现出的高选择性和原子经济性.
- 实现了室温操作,提高了合成可访问性.
结论:
- 开发的光反/PPh3介导的循环化为多种类型的氨酸提供了一条强大的新途径.
- 该方法是高效的,有选择性的,在温和条件下运行.
- 机械洞察力表明,涉及三胺物种的基因介导途径.
相关概念视频
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
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.
2.1K
01:16Cycloaddition Reactions: Overview
2.6K
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.
2.6K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
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.
2.3K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
01:16Cycloaddition Reactions: MO Requirements for Thermal Activation
3.6K
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.
3.6K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K