Synthesis of fused-tetrahydropyrimidines: one-pot methylenation–cyclization utilizing two molecules of CO<sub>2</sub>
作者:Yulei Zhao、Xuqiang Guo、Yulan Du、Xinrui Shi、Shina Yan、Yunlin Liu、Jinmao You
DOI:10.1039/d0ob01504k
日期:——
A methylenation–cyclization reaction, employing cyclic enaminones with primary aromatic amines and two molecules of CO2, furnishing fused-tetrahydropyrimidines, is discussed. In this Cs2CO3 and ZnI2 catalyzed one-pot two-step procedure, two molecules of CO2 were selectively converted to methylene groups. The multi-component reaction might proceed through the formation of bis(silyl)acetal which was
讨论了使用环状烯胺酮与伯芳香胺和两个 CO 2分子,提供稠合四氢嘧啶的亚甲基化-环化反应。在这个Cs 2 CO 3和ZnI 2催化的一锅两步法中,两个CO 2分子被选择性地转化为亚甲基。多组分反应可能通过形成双(甲硅烷基)缩醛进行,然后是缩合和进一步的氮杂-狄尔斯-阿尔德反应。氢喹唑啉、氢环戊二烯[ d ]嘧啶和氢茚并[1,2- d ]嘧啶衍生物可以以CO 2作为C1源有效地制备。
Oligosaccharide Assisted Approach: An Efficient and Facile Access to Isochromeno [4,3-b] Indoles Derivatives in the Presence of Beta Cyclodextrin
作者:Akhilesh Kumar、Pragati Rai、Vijay B. Yadav、I. R. Siddiqui
DOI:10.1007/s10562-018-2592-0
日期:2019.1
A completely eco-friendly and straightforward protocol for the biologically important isochromeno[4,3-b]indoles derivatives has been developed employing beta cyclodextrin in aqueous medium. This documented strategy includes the elimination of hazardous catalysts and volatile organic solvents. Additionally this protocol highlights environmentally benign reaction conditions, short reaction times, operational
New formal (3+3) cycloaddition of enaminones for forming tetracyclic indolo[2,3-b]quinolines under microwave irradiation
作者:Meng-Yuan Li、Hai-Wei Xu、Wei Fan、Qin Ye、Xue Wang、Bo Jiang、Shu-Liang Wang、Shu-Jiang Tu
DOI:10.1016/j.tet.2013.11.022
日期:2014.1
Concise and efficient base-promoted domino formal (3+3) cycloaddition has been established for the formation of tetracyclic indolo[2,3-b]quinoline derivatives under microwave heating. The present methodology shows attractive properties, such as the maximum efficiency of a process, short reaction periods, and operational simplicity, and it can avoid time-consuming and costly syntheses, tedious work-up
已经建立了简捷高效的碱促进的多米诺甲醛缩甲醛(3 + 3)环加成反应,用于在微波加热下形成四环吲哚并[2,3- b ]喹啉衍生物。本方法学显示出有吸引力的性质,例如过程的最大效率,较短的反应时间和操作简便性,并且可以避免耗时且昂贵的合成,繁琐的后处理和中间体的分离。该化学方法为构建四环吲哚并[2,3- b ]喹啉骨架提供了简便而有希望的合成策略。
Catalyst-Controlled Chemoselective Reaction of 3-Indolylmethanols with Cyclic Enaminones Leading to C2-Functionalized Indoles
作者:Xin Li、Wei Tan、Yu-Xin Gong、Feng Shi
DOI:10.1021/jo502782b
日期:2015.2.6
A catalyst-controlledchemoselective formal 1,2-addition of 3-indolylmethanols with cyclic enaminones has been established in the presence of TfOH as a strong acid, which afforded C2-functionalized indole derivatives in generally good yields (up to 89% yield). This reaction not only confronted the great challenge in 1,2-addition of 3-indolylmethanols but also provided a good strategy for C2-functionalization
Tandem Copper(I)‐Catalyzed
<i>N</i>
‐Arylation–1,4‐Conjugate Addition to Access Tetrahydroacridinones
作者:Jyoti M. Honnanayakanavar、Purna Chandra Behera、Surisetti Suresh
DOI:10.1002/adsc.202200877
日期:2022.12.8
copper-catalyzed tandem process integrating N-arylation and 1,4-conjugate addition is disclosed through the reaction of cyclic enaminones and ortho-halochalcones. The reaction appears to proceed through chemoselective arylation on the nitrogen of enaminone with ortho-halochalcones and Michael addition of α-carbon of the enaminone to the chalcone to furnish a diverse range of tricyclic tetrahydroacridinone derivatives