分子印记纳米反应器用于区域选择性 1,3-双极循环添加反应
Huiqi Zhang1, Theeraphon Piacham, Mark Drew
1Pure and Applied Biochemistry, Chemical Center, Lund University, Sweden.
Journal of the American Chemical Society
|March 30, 2006
概括
分子印记聚合物作为化学反应的纳米反应器,增强选择性和速度. 这种方法模仿生物相互作用,用于药物发现的潜在应用.
科学领域:
- 聚合物化学 聚合物化学
- 有机合成 有机合成
- 纳米技术 纳米技术
背景情况:
- 化学反应往往缺乏选择性,导致不必要的副产品.
- 开发效率高,模仿生物系统的催化剂是一个关键的挑战.
- 分子印记提供了一个创建选择性结合位点的途径.
研究的目的:
- 为了利用分子印记聚合物 (MIPs) 作为纳米反应器用于Huisgen 1,3-双极循环添加反应.
- 调查MIP纳米反应器提供的区域选择性和运动加速.
- 通过选择性合成探索MIP在药物发现中的潜力.
主要方法:
- 作为纳米反应器设计的分子印记聚合物的合成.
- MIP纳米反应器在阿齐德和基因的Huisgen 1,3-双极循环添加中的应用.
- 对产品区域选择性和反应动力学的分析.
- 对不同反应物结构的MIP选择性的评估.
主要成果:
- 在Huisgen循环添加中,MIP纳米反应器实现了高产品区域选择性.
- 在MIP纳米反应器中观察到显著的运动加速.
- 纳米反应器表现出了显著的选择性,放大了"最适合"的产品.
- 非共价分子相互作用被用于反应剂结合,类似于生物系统.
结论:
- MIP纳米反应器对于区域选择性和加速的Huisgen循环添加是有效的.
- 在MIP中,非共价结合机制提供了一个仿生方法.
- 这项工作支持药物"克隆"的概念,并推进药物发现的印记和内腔合成.
相关概念视频
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
Regioselectivity and Stereochemistry of Hydroboration
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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...
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.
Cycloaddition Reactions: MO Requirements for Thermal Activation
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.


