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
Enantioselective cyanation of benzylic C–H bonds via copper-catalyzed radical relay
作者:Wen Zhang、Fei Wang、Scott D. McCann、Dinghai Wang、Pinhong Chen、Shannon S. Stahl、Guosheng Liu
DOI:10.1126/science.aaf7783
日期:2016.9.2
sp3-hybridized carbon–hydrogen [C(sp3)–H] bonds in complex organic molecules could facilitate much more efficient preparation of therapeutics and agrochemicals. Here, we report a copper-catalyzed radical relay pathway for enantioselective conversion of benzylic C–H bonds into benzylic nitriles. Hydrogen-atom abstraction affords an achiral benzylic radical that undergoes asymmetric C(sp3)–CN bond formation upon
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
Alkene radical ions constitute an integral and unique class of reactive intermediates for the synthesis of valuable compounds because they have both unpaired spins and charge. However, relatively few synthetic applications of alkene radical anions have emerged due to a dearth of generally applicable and mild radical aniongeneration approaches. Precise control over the chemo- and stereoselectivity
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.