Electrochemically driven desaturation of carbonyl compounds
作者:Samer Gnaim、Yusuke Takahira、Henrik R. Wilke、Zhen Yao、Jinjun Li、Dominique Delbrayelle、Pierre-Georges Echeverria、Julien C. Vantourout、Phil S. Baran
DOI:10.1038/s41557-021-00640-2
日期:2021.4
reagent. This electrochemically driven desaturation exhibits a broad scope across an array of carbonyl derivatives, is easily scalable (1–100 g) and can be predictably implemented into synthetic pathways using experimentally or computationally derived NMR shifts. Systematic comparisons to state-of-the-art techniques reveal that this method can uniquely desaturate a wide array of carbonyl groups. Mechanistic
长期以来,电化学技术因其与生俱来的可持续性而被誉为实现氧化还原反应的有效方法。作为一种基本的有机氧化,羰基去饱和是一种常用的转化方法,通过正式去除两个氢原子来解锁相邻的反应性。迄今为止,实现这种看似微不足道的反应的最可靠方法依赖于过渡金属(Pd 或 Cu)或基于 I、Br、Se 或 S 的化学计量试剂。在这里,我们报告了一种操作简单的途径,可以从烯醇硅烷和以电子为主要试剂的磷酸盐。这种电化学驱动的去饱和在一系列羰基衍生物中表现出广泛的范围,易于扩展(1-100 g),并且可以使用实验或计算得出的 NMR 位移可预测地实施到合成途径中。与最先进技术的系统比较表明,这种方法可以独特地使各种羰基去饱和。机械审讯表明基于自由基的反应途径。
A New Zincate-Mediated Rearrangement Reaction of 2-(1-Hydroxyalkyl)-1-alkylcyclopropanol
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1002/chem.200901054
日期:2010.1.11
A novel rearrangement of 2‐(1‐hydroxyalkyl)‐1‐alkylcyclopropanol has been found. It proceeds in the presence of a catalytic amount of organozinc ate complex to give vic‐diols. The rearrangement can be applied to various types of 2‐(1‐hydroxyalkyl)‐1‐alkylcyclopropanol, which can be easily prepared from the corresponding α,β‐epoxyketones and bis(iodozincio)methane. When bicyclo[13.1.0]pentadecane‐1
Hannaby, Malcolm; Warren, Stuart, Journal of the Chemical Society. Perkin transactions I, 1989, p. 303 - 311
作者:Hannaby, Malcolm、Warren, Stuart
DOI:——
日期:——
The Cinchona Primary Amine-Catalyzed Asymmetric Epoxidation and Hydroperoxidation of α,β-Unsaturated Carbonyl Compounds with Hydrogen Peroxide
作者:Olga Lifchits、Manuel Mahlau、Corinna M. Reisinger、Anna Lee、Christophe Farès、Iakov Polyak、Gopinadhanpillai Gopakumar、Walter Thiel、Benjamin List
DOI:10.1021/ja402058v
日期:2013.5.1
Using cinchona alkaloid-derived primary amines as catalysts and aqueous hydrogenperoxide as the oxidant, we have developed highly enantioselective Weitz-Scheffer-type epoxidation and hydroperoxidation reactions of α,β-unsaturated carbonylcompounds (up to 99.5:0.5 er). In this article, we present our full studies on this family of reactions, employing acyclic enones, 5-15-membered cyclic enones, and
Opportunities for insiders: A catalytic pinacol-type reductiverearrangement of 1,2-internal diols was developed by the use of a simple boron catalyst and two silanes (see scheme). The reaction occurs through a concerted, stereoinvertive mechanism and is applicable to several substrate scaffolds not usually amenable to pinacol-type reactions, such as aliphatic secondary–secondary diols, without the