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。
Samarium(II) iodide induced reductive coupling of nitriles with nitro compounds
作者:Longhu Zhou、Yongmin Zhang
DOI:10.1039/a803077d
日期:——
The intermolecular and intramolecular reductive coupling of a cyano group with a nitro group induced by SmI2 was studied. Amidines and 2-aminoquinoline derivatives are prepared in good yields under neutral and mild conditions respectively.
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
Vanadium-Catalyzed Oxidative C(CO)–C(CO) Bond Cleavage for C–N Bond Formation: One-Pot Domino Transformation of 1,2-Diketones and Amidines into Imides and Amides
作者:Chander Singh Digwal、Upasana Yadav、P. V. Sri Ramya、Sravani Sana、Baijayantimala Swain、Ahmed Kamal
DOI:10.1021/acs.joc.7b00950
日期:2017.7.21
identified that enables their transformation into imides and amides. The reaction proceeds by dual acylation of amidines via oxidative C(CO)–C(CO) bond cleavage of 1,2-diketones to afford N,N′-diaroyl-N-arylbenzamidine intermediates. In the reaction, these intermediates are easily hydrolyzed into imides and amides through vanadium catalysis. This method provides a practical, simple, and mild synthetic