P-Stereogenic pincer iridium complexes: Synthesis, structural characterization and application in asymmetric hydrogenation
摘要:
P-Stereogenic PNP type pincer iridium complexes (PNPIrH2Cl)-Ir-tBuMe (3) and (PNPIrH3)-Ir-tBuMe (4) were synthesized in reasonable yields and characterized by H-1 NMR, C-13 NMR, P-31 NMR, HRMS and/or single crystal X-ray diffraction. The ORTEP diagram shows that the coordination geometry around the iridium center of complex 3 is approximately octahedral. The chlorinated iridium complex (3) and/or the trihydride iridium complex (4) were used as catalysts in the asymmetric hydrogenation of ketones, olefins and quinoline to provide the desired products with up to 17% enantioselectivity. (C) 2015 Elsevier B.V. All rights reserved.
Dual electrocatalysis enables enantioselective hydrocyanation of conjugated alkenes
作者:Lu Song、Niankai Fu、Brian G. Ernst、Wai Hang Lee、Michael O. Frederick、Robert A. DiStasio、Song Lin
DOI:10.1038/s41557-020-0469-5
日期:2020.8
Chiralnitriles and their derivatives are prevalent in pharmaceuticals and bioactive compounds. Enantioselective alkene hydrocyanation represents a convenient and efficient approach for synthesizing these molecules. However, a generally applicable method featuring a broad substrate scope and high functional group tolerance remains elusive. Here, we address this long-standing synthetic problem using
Enantioselective Arylcyanation of Styrenes
<i>via</i>
<scp>Copper‐Catalyzed</scp>
Radical Relay
<sup>†</sup>
作者:Weiwen Zhuang、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.202000494
日期:2021.1
The first copper‐catalyzedenantioselective arylcyanation of styrenes has been developed using readily available anilines as aryl radical precursors under mild conditions, which enables easy access to chiral 2,3‐diaryl propionitriles with moderate to good enantioselectivities. This operationally straightforward reaction exhibits broad substrate scope and functional group tolerance. Notably, this method
Cu-catalyzed enantioselective decarboxylative cyanation <i>via</i> the synergistic merger of photocatalysis and electrochemistry
作者:Yin Yuan、Junfeng Yang、Junliang Zhang
DOI:10.1039/d2sc05428k
日期:——
The development of an efficient and straightforward method for decarboxylative coupling using common alkyl carboxylic acid is of great value. However, decarboxylative coupling with nucleophiles always needs stoichiometric chemical oxidants or substrate prefunctionalization. Herein, we report a protocol for Cu-catalyzed enantioselectivedecarboxylative cyanation via the merger of photocatalysis and