Enantioselective Synthesis of Functionalized Arenes by Nickel‐Catalyzed Site‐Selective Hydroarylation of 1,3‐Dienes with Aryl Boronates
作者:Justin S. Marcum、Tiffany R. Taylor、Simon J. Meek
DOI:10.1002/anie.202004982
日期:2020.8.10
A catalytic method for the site‐selective and enantioselective synthesis of functionalized arenes by the intermolecular hydroarylation of terminal and internal 1,3‐dienes with aryl pinacolato boronates is reported. The reactions are promoted by 5.0 mol % of a readily available monodentate phosphoramidite‐Ni complex in ethanol, affording a variety of enantioenriched products in up to 96 % yield and
transmetal-catalyzed enantioselective cross-coupling reaction of secondary benzylic electrophiles with organoaluminum reagents has been developed. The reaction of secondary benzylic electrophiles with alkynylaluminum reagents provides a mild way for the chiral propargyl compounds bearing aromatic group in high yields with good enantioselectivitiesusing NiBr2·diglyme and (R)-iPr-Pybox as the catalytic system. The
Nickel/Photoredox-Catalyzed Enantioselective Reductive Cross-Coupling between Vinyl Bromides and Benzyl Chlorides
作者:Qianqian Lu、Haixing Guan、Yan-En Wang、Dan Xiong、Tingzhi Lin、Fei Xue、Jianyou Mao
DOI:10.1021/acs.joc.2c00707
日期:2022.6.17
visible-light-promoted nickel/photoredox-catalyzed reductive cross-coupling reaction between vinylbromides and benzyl chlorides is reported. A diverse array of enantioenriched allylic centers containing products could be achieved in good yields (up to 90%) and high enantioselectivities (up to 95% ee). The mechanistic studies show that this reductive cross-coupling involves a radical pathway.