A nanoscale iron catalyst for heterogeneous direct <i>N</i>- and <i>C</i>-alkylations of anilines and ketones using alcohols under hydrogen autotransfer conditions
作者:Madhu Nallagangula、Chandragiri Sujatha、Venugopal T. Bhat、Kayambu Namitharan
DOI:10.1039/c9cc04120f
日期:——
report a commercially available nanoscale Fe catalyst for heterogeneous direct N- and C-alkylation reactions of anilines and methyl ketones with alcohols. A hydrogen autotransfer mechanism has been found to operate in these reactions by deuterium labelling studies. In addition, dehydrogenative quinoline synthesis has been demonstrated from amino benzyl alcohols and acetophenones.
Fragment‐like naturalproducts were identified as ligand‐efficient chemical matter for hit‐to‐lead development and chemical‐probe discovery. Relying on a computational method using a topological pharmacophore descriptor and a drug database, several macromoleculartargets from distinct protein families were expeditiously retrieved for structurally unrelated chemotypes. The selected fragments feature
Ruthenium-catalyzed acceptorless dehydrogenative coupling of o-aminobenzyl alcohols with ketones to quinolines in the presence of carbonate salt
作者:Xiangchao Xu、Yao Ai、Rongzhou Wang、Liping Liu、Jiazhi Yang、Feng Li
DOI:10.1016/j.jcat.2020.12.016
日期:2021.3
Cl][Cl] was designed, synthesized and found to be a general and highly efficient catalyst for the synthesis of quinolines via acceptorless dehydrogenative coupling of o-aminobenzyl alcohols with ketones in the presence of carbonate salt. It was confirmed that NH units in the ligand are crucial for catalytic activity. The application of this catalytic system for the scale-gram synthesis of biologically
The Diverse One-Pot Reactions of 2-Quinolylzincates: Homologation, Electrophilic Trapping, Hydroxylation, and Arylation Reactions
作者:Hye Jin Jeong、Suyeon Chae、Keunhong Jeong、Sung Keon Namgoong
DOI:10.1002/ejoc.201801192
日期:2018.12.6
The diverse C‐2 functionalizations of quinoline are successfully achieved via 2‐quinolylzincate intermediates by the four different types of title reactions.
NiH-Catalyzed Hydroamination/Cyclization Cascade: Rapid Access to Quinolines
作者:Yang Gao、Simin Yang、Yanping Huo、Qian Chen、Xianwei Li、Xiao-Qiang Hu
DOI:10.1021/acscatal.1c02055
日期:2021.7.2
metal-H-catalyzed hydroamination methodologies, considerable limitations still exist in the selectivehydroamination of alkynes, especially for terminalalkynes. Herein, we develop a highly efficient NiH catalytic system that activates readily available alkynes for a cascade hydroamination/cyclization reaction with anthranils. This mild, operationally simple protocol is amenable to a wide array of alkynes including
尽管金属-H 催化的加氢胺化方法取得了重大成功,但炔烃的选择性加氢胺化仍然存在相当大的局限性,特别是对于末端炔烃。在此,我们开发了一种高效的 NiH 催化系统,可激活容易获得的炔烃,用于与邻氨基苯甲酸的级联加氢胺化/环化反应。这种温和、操作简单的方案适用于各种炔烃,包括末端和内部、芳基和烷基、缺电子和富电子的炔烃,提供结构多样的喹啉,产率非常高(>80 个例子,高达 93%屈服)。该程序的效用体现在几种天然产物的后期功能化以及抗肿瘤分子墓地宁和三链 DNA 嵌入剂的简明合成中。