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阴极合电解以获取双电
Tianyu He1, Chaoqiang Liang1, Haoyuan Cheng1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Organic letters
|January 11, 2024
概括
研究人员开发了一种新的电化学方法,用于合成二甲. 这种多功能技术提供了温和的条件,广泛的基质范围,并使复杂分子合成的有效的C-H功能化成为可能.
科学领域:
- 有机化学 有机化学
- 电化学 电化学 电化学
- 合成方法论 合成方法论
背景情况:
- 双烯酸是药品和材料科学中重要的结构动图.
- 合成二甲的传统方法通常需要恶劣的条件或有限的基质范围.
- 开发高效和多功能合成路径仍然是有机合成的一个关键挑战.
研究的目的:
- 报告一种新的电化学方法,用于合成二甲.
- 为了证明开发的方法的广泛适用性和温和反应条件.
- 展示这种方法在复杂分子合成和后期功能化中的实用性.
主要方法:
- 多种N-异素与异酸盐的电化学合.
- 使用pH和氧化还原中性条件,耐受外源空气或水分.
- 建立了一个单,两步协议,用于正式的C-H/C-H合异质.
主要成果:
- 成功合成了一系列具有优异区域选择性的双甲基.
- 通过开发的C-H/C-H合协议证明了广泛的基质可用性.
- 验证了该方法在后期功能化和尼特拉里丁的总合成中的实用性.
结论:
- 报道的电化学方法提供了一种高效和多功能途径,以biheteroaryls.
- 该方法的温和条件和对空气/水分的耐受性提高了其实际适用性.
- 这种方法显著扩大了合成构建复杂异环化合物的可能性.
相关概念视频
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
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.
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.
2.0K
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
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
01:17Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene
5.7K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
5.7K