Alkyltriflate-Triggered Annulation of Arylisothiocyanates and Alkynes Leading to Multiply Substituted Quinolines through Domino Electrophilic Activation
摘要:
The reaction of arylisothiocyanate, alkyltriflate, and alkynes leads to variously substituted quinolines in high yields. The reaction undergoes alkyltriflate-triggered domino electrophilic activation and avoids the use of a transition-metal catalyst. A variety of functional groups are tolerated in the quinoline ring.
novel copper promoted synthesis of substituted quinolines from various benzylic azides and internal alkynes has been demonstrated. The reaction features a broad substrate scope, high product yields and excellent regioselectivity. In contrast to the known two-step process of acid promoted [4 + 2] cycloaddition reaction and oxidation, the present methodology allows the synthesis of quinolines in a single
DMSO/<i>t</i>-BuONa/O<sub>2</sub>-Mediated Aerobic Dehydrogenation of Saturated <i>N</i>-Heterocycles
作者:Ruchun Yang、Shusheng Yue、Wei Tan、Yongfa Xie、Hu Cai
DOI:10.1021/acs.joc.9b03447
日期:2020.6.5
Aromatic N-heterocycles such as quinolines, isoquinolines, and indolines are synthesized via sodium tert-butoxide-promoted oxidative dehydrogenation of the saturated heterocycles in DMSO solution. This reaction proceeds under mild reaction conditions and has a good functional group tolerance. Mechanistic studies suggest a radical pathway involving hydrogen abstraction of dimsyl radicals from the N–H
Base-Catalyzed Cascade Reaction of <i>ortho</i>
-(Propargylamino)aryl Ketones with N-, O-, or S-Based Nucleophiles for the Synthesis of 3-Functionalized Quinoline Scaffolds
作者:Liu-Zhu Yu、Hao-Zhao Wei、Min Shi
DOI:10.1002/adsc.201800120
日期:2018.5.16
A metal‐free and base‐catalyzed cascade reaction of ortho‐(propargylamino)aryl ketones with primary alcohols, secondary amines, including various N‐heterocycles, and thiols through 1,4‐benzoxazepine intermediates was developed, providing a series of synthetically and medically valuable 3‐functionalized quinoline derivatives. The reaction process was easily manipulable and environmentally benign, producing
Carbon annulation of ortho-vinylanilines with dimethyl sulfoxide to access 4-aryl quinolines
作者:Jin Yuan、Jin-Tao Yu、Yan Jiang、Jiang Cheng
DOI:10.1039/c6ob02714h
日期:——
A palladium-catalyzed annulation of ortho-vinylanilines with dimethylsulfoxide was developed to access 4-aryl quinolines in moderate to good yields. Activated by 1,4-diazabicyclo[2.2.2]octane bis(sulfur dioxide) adduct (DABSO), DMSO served as a “CH–” fragment in this transformation. It represents a facile pathway leading to 4-aryl quinolines.
efficient one-pot aerobic process for the synthesis of functionalized/annulated quinolines is devised from easily available 2-aminobenzyl alcohol/2-aminobenzophenones and alkyl/aryl alcohols for the first time. The process involves two sequential reactions, namely in situ aerial oxidation of alcohols to the corresponding aldehydes/ketones followed by Friedländer annulation.