硫的立体特异性脱碳酶化化
Jimmie D Weaver1, Being J Ka, David K Morris
1Department of Chemistry, The University of Kansas, 2010 Malott Hall, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA.
Journal of the American Chemical Society
|August 19, 2010
概括
这项研究引入了一种新的催化脱碳酶化合,用于制造三级同质硫. 该反应具有高度立体特异性,在温和条件下进行,并为有价值的硫化合物提供了一条有效的途径.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 立体化学是一种立体化学.
背景情况:
- 三级同硫的立体特异性形成具有挑战性.
- 现有的方法通常需要恶劣的条件 (例如,-100°C) 和预制有机金属.
研究的目的:
- 开发一种温和高效的方法,用于三级同质硫的立体特异合成.
- 为了探索一个催化脱碳氧化化化途径.
主要方法:
- 使用基硫酸作为基质.
- 采用催化剂进行脱碳氧化化.
- 调查反应动力学和立体特异性.
主要成果:
- 在高产量中实现了高立体特异性三级同硫的形成.
- 反应在温和,非基础条件下进行,没有固体测量添加剂.
- 由于在种族化上快速结合而表现出高的因子特异性.
结论:
- 开发了一种新的,温和的,高效的催化脱碳氧化.
- 该方法提供了一条立体特定的途径,以获得有价值的同质硫.
- 计算研究支持观察到的高因子特异性.
相关概念视频
Preparation and Reactions of Sulfides
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.
SN2 Reaction: Stereochemistry
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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.
Electrophilic Aromatic Substitution: Sulfonation of Benzene
Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.

