通过催化循环化合成的阿扎斯皮罗[n.2]的酶选择性和二元选择性合成
Joshua K Sailer1, Duc Ly1, Andrew Wang1
1Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States.
概括
这项研究提出了一种合成螺旋cyclopropanes的新方法,在药物发现中至关重要. 使用性迪催化剂,它实现了高度选择性的阿扎斯皮罗-[n.2]-的合成,提高了药物开发效率.
科学领域:
- 有机化学 有机化学
- 药用化学 医学化学
- 催化剂是一种催化剂.
背景情况:
- 螺旋cyclopropanes是许多药物的关键结构单元.
- 现有的立体选择性螺旋cyclopropane合成方法是有限的,阻碍了药物发现.
- 需要有效的和有选择性的合成途径.
研究的目的:
- 开发一种用于合成azaspiro-[n.2]-alkanes的新方法.
- 在合成中实现高立体选择性 (enantioselectivity和 diastereoselectivity).
- 探索四碳酸盐催化剂在这种转化中的实用性.
主要方法:
- 使用捐赠/接受碳化合物,对外环烯的催化循环化.
- 使用一种性迪四碳酸盐催化剂,特别是Rh2 ((p-PhTPCP) 4.
- 利用计算研究来理解立体选择性控制.
主要成果:
- 开发的方法成功合成了各种阿扎斯皮罗-[n.2]-基.
- 该Rh2(p-PhTPCP) 4催化剂显示了对对称的阿扎西克罗甲基烯的高反选择性.
- 对于非对称的阿扎西克洛米甲基基来来说,可以达到高的异位选择性和异位选择性,最高可达到83,000次的营业额.
- 计算分析表明基质适合于催化剂的性口袋中,这决定了立体选择性.
结论:
- 建立了一个高效和立体选择性的阿扎斯皮罗-[n.2]-基合成.
- 性迪罗催化剂为构建复杂的螺旋环结构提供了一个强大的工具.
- 这种方法对加快需要螺旋cyclopropane动机的药物发现活动具有重要意义.
更多相关视频
相关概念视频
Preparation of 1° Amines: Azide Synthesis
4.6K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.6K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
2.8K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.8K
Cycloaddition Reactions: Overview
3.4K
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.
3.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
12.6K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
12.6K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.0K
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.
9.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.8K
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...
3.8K


