10%钯/碳(10%Pd / C )在氧气下在加热的二甲亚砜(DMSO)中催化量的吡啶N-氧化物的存在下,成功催化了各种N-甲磺酰化的2-氨基联苯的分子内CH胺化反应气氛下得到相应的N-甲磺酰基咔唑。基于单电子清除剂四氰基喹二甲烷(TCNQ)的显着抑制作用,该反应将通过单电子转移过程进行,并且底物芳环上的取代基对反应进程的影响很小。
10%钯/碳(10%Pd / C )在氧气下在加热的二甲亚砜(DMSO)中催化量的吡啶N-氧化物的存在下,成功催化了各种N-甲磺酰化的2-氨基联苯的分子内CH胺化反应气氛下得到相应的N-甲磺酰基咔唑。基于单电子清除剂四氰基喹二甲烷(TCNQ)的显着抑制作用,该反应将通过单电子转移过程进行,并且底物芳环上的取代基对反应进程的影响很小。
Transition-metal-free and organic solvent-free conversion of <i>N</i>-substituted 2-aminobiaryls into corresponding carbazoles <i>via</i> intramolecular oxidative radical cyclization induced by peroxodisulfate
作者:Palani Natarajan、Priya Priya、Deachen Chuskit
DOI:10.1039/c7gc03130k
日期:——
benign approach for the synthesis of N-substituted carbazoles from analogous 2-aminobiaryls using peroxodisulfate in water is reported. The reactions proceeded through an intramolecular oxidative radical cyclization of N-substituted 2-aminobiaryls with in situ reoxidation of the resulting radical species. When compared to known methods for the synthesis of N-substituted carbazoles from 2-amidobiaryls, this
10% Palladium on carbon (10% Pd/C) successfully catalyzed the intramolecular C−H amination of various N‐mesylated 2‐aminobiphenyls in the presence of a catalytic amount of pyridine N‐oxide in heated dimethyl sulfoxide (DMSO) under an oxygen atmosphere to afford the corresponding N‐mesylcarbazoles. The reaction would proceed via a single‐electron transfer process based on its significant suppression
10%钯/碳(10%Pd / C )在氧气下在加热的二甲亚砜(DMSO)中催化量的吡啶N-氧化物的存在下,成功催化了各种N-甲磺酰化的2-氨基联苯的分子内CH胺化反应气氛下得到相应的N-甲磺酰基咔唑。基于单电子清除剂四氰基喹二甲烷(TCNQ)的显着抑制作用,该反应将通过单电子转移过程进行,并且底物芳环上的取代基对反应进程的影响很小。