Metal-catalyzed coupling process comprising reacting a compound of general formula 1 with a compound A-X, to obtain a compound of general formula 2, which may further be converted to a compound of general formula 3
Pd-Catalyzed Direct C–H Alkenylation and Allylation of Azine <i>N</i>-Oxides
作者:Fares Roudesly、Luis F. Veiros、Julie Oble、Giovanni Poli
DOI:10.1021/acs.orglett.8b00689
日期:2018.4.20
A Pd-catalyzed direct C2-alkenylation of azine N-oxides with allyl acetate is disclosed. The products are formed through an allylation/isomerization cascade process. The use of a tri-tert-butylphosphonium salt as the ligand precursor and KF is mandatory for optimal yields. When cinnamyl acetate is used, the same catalytic system promotes C2-cinnamylation of the azine N-oxide without subsequent isomerization
Site-Selective Functionalization of Pyridinium Derivatives via Visible-Light-Driven Photocatalysis with Quinolinone
作者:Inwon Kim、Gyumin Kang、Kangjae Lee、Bohyun Park、Dahye Kang、Hoimin Jung、Yu-Tao He、Mu-Hyun Baik、Sungwoo Hong
DOI:10.1021/jacs.9b02013
日期:2019.6.12
photocatalyst, we developed a catalytic system driven by visible light that forms phosphinoyl and carbamoyl radicals, which react with various heteroarenium derivatives under mild, transition-metal-free conditions. This straightforward and environmentally friendly synthetic method represents a new approach to site-divergent pyridine functionalization that offers considerable advantages in both simplicity and
Visible‐Light‐Induced Pyridylation of Remote C(sp
<sup>3</sup>
)−H Bonds by Radical Translocation of N‐Alkoxypyridinium Salts
作者:Inwon Kim、Bohyun Park、Gyumin Kang、Jiyun Kim、Hoimin Jung、Hyeonyeong Lee、Mu‐Hyun Baik、Sungwoo Hong
DOI:10.1002/anie.201809879
日期:2018.11.19
Metal‐free, visible‐light‐induced site‐selective heteroarylation of remote C(sp3)−H bonds has been accomplished through the design of N‐alkoxyheteroarenium salts serving as both alkoxy radical precursors and heteroaryl sources. The transient alkoxy radical can be generated by the single‐electron reduction of an N‐alkoxypyridinium substrate by a photoexcited quinolinone catalyst. Subsequent radical translocation
Base-promoted, deborylative secondary alkylation of N-heteroaromatic N-oxides with internal gem-bis[(pinacolato)boryl]alkanes: a facile derivatization of 2,2′-bipyridyl analogues
作者:Chiwon Hwang、Woohyun Jo、Seung Hwan Cho
DOI:10.1039/c7cc03731g
日期:——
A base-promoted, secondary alkylation of N-heteroaromatic N-oxides using internal gem-bis[(pinacolato)boryl]alkanes as alkylation reagents is reported. The reaction exhibit broad scope, providing deoxygenated secondary alkylated N-heteroaromatic compounds with high efficiency. The usefulness of the developed protocol is evidenced by sequential direct alkylation of 2,2′-bipyridine-N-oxide.