可见光诱导的级联染色体循环/化,以使用元素硫/来获得3基化
Tao Guo1, Chuanhu Gao1, Zhonghui Li1
1School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China.
概括
一种新的可见光反应有效地利用元素硫和合成3-基基. 这种方法提供了一种温和而通用的方法,用于在室温下创建有价值的染色子衍生物.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
- 摄影化学的使用.
背景情况:
- 染色体衍生物是药物化学中的重要支架.
- 功能化染色体的高效合成仍然是一个挑战.
- 可见光光催化剂为有机合成提供了一种可持续的方法.
研究的目的:
- 开发一种温和而高效的方法来合成3基基.
- 为了利用可见光诱导的级联反应用于染色体功能化.
- 采用随时可用的元素硫和作为原源.
主要方法:
- 一种三组分反应,涉及染色体前体,元素硫 (S8) 或 (Se),以及可见光光催化剂.
- 在温和,室温条件下的反应优化.
- 使用光谱技术对合成的3-基基产品进行表征.
主要成果:
- 成功开发了一种可见光诱导的级联反应,用于染色体循环和化.
- 有效合成各种3 - 基基基,产量好.
- 已证明具有广泛的基质范围和良好的功能组耐受性.
结论:
- 开发的方法提供了一个方便而有吸引力的途径,用于合成3-基基.
- 反应是温和的,高效的,在室温可见光照射下运行.
- 这种方法扩大了合成工具箱,用于访问功能化染色体衍生物.
相关概念视频
Preparation and Reactions of Sulfides
4.7K
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.
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Halogenation of Alkenes
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Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
15.3K
Preparation and Reactions of Thiols
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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation
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Photochemical Electrocyclic Reactions: Stereochemistry
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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
Electrophilic Addition to Alkynes: Halogenation
8.1K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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