A Mild Hydroaminoalkylation of Conjugated Dienes Using a Unified Cobalt and Photoredox Catalytic System
作者:Scott M. Thullen、Tomislav Rovis
DOI:10.1021/jacs.7b09252
日期:2017.11.1
functionalities may be stitched together become available. Herein we describe the coupling of photoredox-generated α-amino radical species with conjugated dienes using a unified cobalt and iridium catalyticsystem in order to access a variety of useful homoallylic amines from simple commercially available starting materials. We present a series of mechanistic experiments that support the intervention of
Direct Formic Acid Mediated
<i>Z</i>
‐Selective Reductive Coupling of Dienes and Aldehydes
作者:Christopher Cooze、Raphael Dada、Rylan J. Lundgren
DOI:10.1002/anie.201905540
日期:2019.8.26
carbonyls to generate Z-olefin products remain rare and often require either alkyl borane or zinc reductants, limiting their utility. Demonstrated here is that formic acidmediates the Rh-catalyzed, Z-selective coupling of dienes and aldehydes. The process is distinguished by broad tolerance towards reducible or electrophilic groups. Kinetic analysis suggests that generation of the catalytically active
Various carboxylic esters including functionalized ones are prepared in good yields from equimolar amounts of free carboxylic acids and alcohols under mild conditions by the use of 2-chloro- or 2-bromopyridinium salt, a new and efficient coupling reagent.
Chemoselective Synthesis of <i>Z</i>
-Olefins through Rh-Catalyzed Formate-Mediated 1,6-Reduction
作者:Raphael Dada、Zhongyu Wei、Ruohua Gui、Rylan J. Lundgren
DOI:10.1002/anie.201800361
日期:2018.4.3
Z‐olefins are important functional units in synthetic chemistry; their preparation has thus received considerable attention. Many prevailing methods for cis‐olefination are complicated by the presence of multiple unsaturated units or electrophilic functional groups. In this study, Z‐olefins are delivered through selective reduction of activated dienes using formic acid. The reaction proceeds with high
Site‐Selective Hydrogenation of Electron‐Poor Alkenes and Dienes Enabled by a Rhodium‐Catalyzed Hydride Addition/Protonolysis Mechanism**
作者:Duanyang Kong、Qiqige Qiqige、Wesley McNutt、Rocco Paciello、Ansgar Schäfer、Mathias Schelwies、Rylan J. Lundgren
DOI:10.1002/anie.202210601
日期:2022.10.10
Rh(CO)2acac/xantphos in methanol catalyzes the selective mono-hydrogenation of electron-poor dienes and related substrates at low metal loadings via a hydride addition/Rh-enolate protonation pathway.