Copper-Catalyzed Regioselective Reaction of Internal Alkynes and Diaryliodonium Salts
作者:Ze-Feng Xu、Chen-Xin Cai、Jin-Tao Liu
DOI:10.1021/ol4003543
日期:2013.5.3
The copper-catalyzed highly regioselective reaction of internal alkynes with diaryliodonium salts was achieved for the first time. α-Arylketones were obtained in moderate to good yields from arylpropargylic alcohols or aryl alkyl alkynes under mild conditions. It was found that the two kinds of substrates underwent two different arylation–oxygenation pathways under different reaction conditions based
Quadruple N-heterocyclic carbene/cobalt/photoredox/Brønsted base catalysis is demonstrated, realizing branch-selective hydroacylation of styrenes with aromatic and aliphatic aldehydes. This protocol allows to access branched ketones from readily available materials in an atom-economical manner. The quadruple catalysis can transfer a formyl hydrogen of aldehydes as hydrogen radical equivalent onto terminal
Ni-Catalyzed Mild Arylation of α-Halocarbonyl Compounds with Arylboronic Acids
作者:Chao Liu、Chuan He、Wei Shi、Mao Chen、Aiwen Lei
DOI:10.1021/ol702456z
日期:2007.12.1
simple yet powerful Ni catalyst can be used to promote direct arylations of alpha-halocarbonyl compounds, including a range of esters, amides, and ketones, with various arylboronic acids under mild conditions. The method tolerates beta-hydrogens and functional groups in the substrates and offers reactivity and selectivity profiles that are complementary to those found in the well-established Buchwald-Hartwig approach.