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。
Silver–copper co-catalyzed cascade intramolecular cyclization/desulfinamide/dehydrogenation: one-pot synthesis of substituted carbazoles
作者:Yuanqiong Huang、Zhonglin Guo、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c8cc03600d
日期:——
Herein, a silver and copper co-catalyzed cascade intramolecular cyclization/desulfinamide/dehydrogenation reaction for the synthesis of substituted carbazoles is reported. This reaction, which involved formation of new C–C and C–N bonds as well as C–N bond cleavage, afforded diverse carbazoles in high yields and showed good functional group tolerance.
Electrochemical
<scp>Palladium‐Catalyzed</scp>
Intramolecular C—H Amination of
<scp>2‐Amidobiaryls</scp>
for Synthesis of Carbazoles
作者:Qingqing Wang、Xiaojing Zhang、Pan Wang、Xinlong Gao、Heng Zhang、Aiwen Lei
DOI:10.1002/cjoc.202000407
日期:2021.1
The synthesis of carbazoles based on the electrochemical Pd‐catalyzed intramolecularC—H amination of 2‐amidobiaryls through oxidative cross coupling has been achieved under mild reaction conditions. The reaction can be carried out in undivided cell without the addition of external chemical oxidant. Besides good functional group compatibility, the desired carbazoles can be scaled up and modified easily
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
Novel synthetic strategy of carbolines via palladium-catalyzed amination and arylation reaction
作者:Takehiko Iwaki、Akito Yasuhara、Takao Sakamoto
DOI:10.1039/a901088b
日期:——
Four parent carbolines and the corresponding 5- or 9-methylsulfonyl derivatives were synthesized by the palladium-catalyzed intramolecular arylation reaction of ortho-bromo-substituted anilinopyridines which were prepared by the palladium-catalyzed amination reaction of iodobenzenes with aminopyridines. Carbazole and its 9-methylsulfonyl derivative were also synthesized by the same method.