Iridium-Catalyzed C-Alkylation of Methyl Group on <i>N</i>-Heteroaromatic Compounds using Alcohols
作者:Mitsuki Onoda、Ken-ichi Fujita
DOI:10.1021/acs.orglett.0c02635
日期:2020.9.18
In this study, we developed a catalytic system for the C-alkylation of a methyl group on N-heteroaromatic compounds, including pyridine, pyrimidine, pyrazine, quinoline, quinoxaline, and isoquinoline, using alcohols based on a hydrogen-borrowing process with [Cp*IrCl2]2 (Cp*: η5-pentamethylcyclopentadienyl) combined with potassium t-butoxide and 18-crown-6-ether as the catalyst precursor.
A new route to E-Stilbenes, based on the transitionmetalfree, KOtBu/DMF promoted activation and directcoupling of alcohols with phenyl acetonitriles, is reported. A variation allowing the selective synthesis of N-Heteroarenes and a mechanism proceeding via the activation of alcohols under alkyl formate intermediates are also reported.
报道了一种基于不含过渡金属、KO t Bu/DMF 的E-二苯乙烯的新途径,它促进了醇与苯基乙腈的活化和直接偶联。还报道了一种允许选择性合成 N-杂芳烃的变化以及通过在甲酸烷基酯中间体下活化醇进行的机制。
Transition-Metal-Free Anti-Markovnikov Hydroarylation of Alkenes with Aryl Chlorides through Consecutive Photoinduced Electron Transfer
The hydroarylation of alkenes has emerged as a powerful strategy for arene functionalization. However, aryl chlorides remain a large challenge in this type of reaction due to the chemical inertness of the C(sp2)–Cl bond and high negative reduction potential. Herein, we report an anti-Markovnikov radical hydroarylation of alkenes with aryl chlorides via visible-light photoredox catalysis. The key reactive