Regioselective cleavage of O-benzyl-N-arylamidoximes: synthesis of N-aryl amidines and amidoximes
摘要:
O-Benzyl-N-arylamidoximes have been regioselectively deprotected to provide either N-aryl amidines or amidoximes. As a result, the targeted compounds can now be prepared using palladium-catalyzed N-arylation chemistry. (C) 2002 Elsevier Science Ltd. All rights reserved.
Direct Synthesis of 3-Acylindoles through Rhodium(III)-Catalyzed Annulation of<i>N</i>-Phenylamidines with α-Cl Ketones
作者:Jianhui Zhou、Jian Li、Yazhou Li、Chenglin Wu、Guoxue He、Qiaolan Yang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.8b03383
日期:2018.12.7
versatile 3-acylindoles through Rh(III)-catalyzed C–H activation and annulation cascade of N-phenylamidines with α-Cl ketones was developed, in which α-Cl ketones serve as unusual one-carbon (sp3) synthons. This strategy features high regioselectivity, efficiency, wide substrate tolerance, and mild reaction conditions, which further underscore its synthetic utility in drug molecule synthesis.
We have developed a visible light-induced photo-redox copper-catalyzed oxidative Csp2–H annulation (Friedel–Crafts-type cyclization) of amidines with terminalalkynes at room temperature to synthesize functionalized quinazolines. We report copper(I)-phenylacetylide catalyzed photo-oxidative Csp2–H annulation of amidines at RT, which is very challenging and complementary to the conventional transition
我们开发了一种可见光诱导的光氧化还原铜催化氧化 C sp 2 -H 环化(Friedel-Crafts 型环化)与末端炔烃在室温下合成功能化喹唑啉。我们报告了铜(I)-苯乙炔在室温下催化的脒的光氧化 C sp 2 -H 环化,这是非常具有挑战性的,并且与传统的过渡金属催化的热环化反应互补。我们已经通过合成抗癌化合物证明了这种方法的应用。此外,绿色化学指标(E-factor 比报道的热方法好 1.9 倍)和 Eco-Scale(尺度 55.4,显示可接受的合成)评估表明该方法是生态友好和环境可行的。
Copper-Catalyzed Three-Component Synthesis of 3-Aminopyrazoles and 4-Iminopyrimidines via β-Alkynyl-<i>N</i>-sulfonyl Ketenimine Intermediates
作者:Yanpeng Xing、Binyu Cheng、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/ol502302w
日期:2014.9.19
4-iminopyrimidines were efficiently prepared via copper-catalyzedthree-componentreactions of butadiynes, sulfonylazides, and hydrazides or imidamides. The reactions were regioselectively approached via the formation of a β-alkynyl-N-sulfonyl ketenimine intermediate which represented a new and effective 1,3-dielectrophilic equivalent in organic synthesis.
One-Pot Protocol for the Synthesis of Imidazoles and Quinoxalines using<i>N</i>-Bromosuccinimide
作者:Sachin D. Pardeshi、Pratima A. Sathe、Kamlesh S. Vadagaonkar、Atul C. Chaskar
DOI:10.1002/adsc.201700900
日期:2017.12.11
N‐bromosuccinimide (NBS)‐mediated one‐pot, green, efficient and practical synthesis of substituted imidazoles and quinoxalines has been achieved by the reaction of styrenes with N‐arylbenzamidines and o‐phenylenediamines, respectively, in a water:1,4‐dioxane mixture. The reaction involves formation of an α‐bromo ketone as an intermediate in the presence of NBS and water, followed by condensation with
Quinazolinones have broad applications in the biological, pharmaceutical and material fields. Studies on the synthesis of these compounds are therefore widely conducted. Herein, a novel and highly efficient copper-mediated tandem C(sp2)–H amination and annulation of benzamides and amidines for the synthesis of quinazolin-4(1H)-ones is proposed. This synthetic route can be useful for the construction of quinazolin-4(1H)-one