Copper-Catalyzed Asymmetric Reaction of Alkenyl Diynes with Styrenes by Formal [3 + 2] Cycloaddition via Cu-Containing All-Carbon 1,3-Dipoles: Access to Chiral Pyrrole-Fused Bridged [2.2.1] Skeletons
作者:Feng-Lin Hong、Yang-Bo Chen、Si-Han Ye、Guang-Yu Zhu、Xin-Qi Zhu、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.0c01918
日期:2020.4.22
metal-containing 1,3-dipoles from metal carbenes represents a significant advance in 1,3-dipolar cycloaddition reactions. However, these transformations have so far been limited to reactions based on diazo compounds or triazoles as precursors. Herein, we disclose a copper-catalyzed enantioselective reaction of alkenyl N-propargyl ynamides with styrene derivatives by formal [3 + 2] cycloaddition via Cu-containing all-carbon
Divergent and Synergistic Photocatalysis: Hydro- and Oxoalkylation of Vinyl Arenes for the Stereoselective Synthesis of Cyclopentanols via a Formal [4+1]-Annulation of 1,3-Dicarbonyls
are initiated through the formation of polarity-reversed C-centered-radical intermediates at the active methylene center of 1,3-dicarbonyls via direct photocatalytic C–H bond transformations. The oxoalkylation of alkenes is achieved under aerobic conditions via a Cu(II)-photomediated rebound mechanism, while the corresponding hydroalkylation becomes possible under a nitrogen atmosphere by the combination
Uncovering the On-Pathway Reaction Intermediates for Metal-Free Atom Transfer Radical Addition to Olefins through Photogenerated Phenalenyl Radical Anion
作者:Paramita Datta、Debojyoti Roy、Divya Jain、Shiv Kumar、Swagata Sil、Anup Bhunia、Jyotishman Dasgupta、Swadhin K. Mandal
DOI:10.1021/acscatal.3c05688
日期:2024.3.1
powerful approach for atom transfer radicaladdition (ATRA) while generating the desired intermediates that are otherwise difficult to access with traditional methods. However, photoredox ATRA with organic photosensitizers is rare, giving an opportunity for metal-free routes to complex organic synthesis. Here, we demonstrate exquisite control of product selectivity for addition reactions of in situ generated
A photoredox-catalyzed three-component sulfonoaminoformyloxylation reaction between alkenes, N-aminopyridinium salts and DMF has been developed, which avoids the usage of erosive formic acid as the formyloxylation reagent. Besides DMF, alkyl and aryl carboxylic acids proved to be feasible nucleophiles to afford various β-amino esters. The robustness of this method was further demonstrated by its applicability
A photoredox-catalyzed unsymmetrical diamination of alkenes by using N-aminopyridinium salts and nitriles as the amination reagents has been developed. Various vicinal diamines were obtained in moderate to excellent yields under mild reaction conditions. Furthermore, this protocol could be applied in the late-stage modification of pharmaceuticals and natural products. Preliminary mechanistic studies