Herein, we report the first example of group transfer radical addition of O-vinylhydroxylamine derivatives onto unactivatedalkenes. By utilizing O-vinylhydroxylamine derivatives as both the N- and C-donors, this reaction enables intermolecular carboamination of unactivatedalkenes in an atom economical fashion. As the process is initiated through N-radical addition followed by C-transfer, linear carboamination
在此,我们报告了第一个将 O-乙烯基羟胺衍生物基团转移自由基加成到未活化烯烃上的例子。通过使用 O-乙烯基羟胺衍生物作为 N 和 C 供体,该反应能够以原子经济的方式对未活化的烯烃进行分子间碳胺化。由于该过程是通过 N-自由基加成和 C-转移引发的,因此提供了线性碳胺化产物。这与烯烃的经典自由基碳官能化不同,后者通常有利于支链产物,因为它是由 C-自由基加成引发的。
Rh(III)-Catalyzed Cyclopropanation Initiated by C–H Activation: Ligand Development Enables a Diastereoselective [2 + 1] Annulation of N-Enoxyphthalimides and Alkenes
作者:Tiffany Piou、Tomislav Rovis
DOI:10.1021/ja506579t
日期:2014.8.13
N-Enoxyphthalimides undergo a Rh(III)-catalyzedC–Hactivationinitiatedcyclopropanation of electron deficient alkenes. The reaction is proposed to proceed via a directed activation of the olefinic C–H bond followed by two migratory insertions, first across the electron-deficient alkene and then by cyclization back onto the enol moiety. A newly designed isopropylcyclopentadienyl ligand drastically
α-Quaternary Mannich Bases through Copper-Catalyzed Amination-Induced 1,2-Rearrangement of Allylic Alcohols
作者:Wei-Zhi Weng、Jian-Guo Sun、Ping Li、Bo Zhang
DOI:10.1002/chem.201702428
日期:2017.7.21
A novel copper‐catalyzed amination‐induced 1,2‐rearrangement reaction of allylic alcohols has been developed under simple and mild conditions. The commercially available N‐fluorobenzenesulfonimide (NFSI) is employed as an amination reagent. In this transformation, not only alkyl, but also aryl substituents can efficiently undergo 1,2‐carbon atom migration, thereby providing an efficient and powerful
Rhodium(III)-Catalyzed Cyclopropanation of Unactivated Olefins Initiated by C–H Activation
作者:Erik J. T. Phipps、Tiffany Piou、Tomislav Rovis
DOI:10.1055/s-0039-1690130
日期:2019.9
We have developed a Rh(III)-catalyzed cyclopropanation of unactivated olefins initiated by an alkenyl C-H activation. A variety of 1,1-disubstituted olefins undergo efficient cyclopropanation with a slight excess of alkene stoichiometry. A series of mechanistic interrogations implicate a metal-carbene as an intermediate.
Azides are building blocks of increasing importance in synthetic chemistry, chemical biology, and materials science. Azidobenziodoxolone (ABX, Zhdankin reagent) is a valuable azide source, but its safety profile has not been thoroughly established. Herein, we report a safety study of ABX, which shows its hazardous nature. We introduce two derivatives, tBu-ABX and ABZ (azidobenziodazolone), with a better