在
alizarin red S 、 eosin Y disodium salt 作用下,
以
丙酮 为溶剂,
反应 5.0h,
以94%的产率得到methyl 9,11-dioxo-10-phenyl-6,9,10,11-tetrahydro-5H-pyrrolo[3',4':3,4]pyrrolo[2,1-a]isoquinoline-8-carboxylate
参考文献:
名称:
双有机染料作为拟氧化还原介导体系促进可见光下串联氧化/[3+2]环加成反应
摘要:
已经开发了一种原子经济和阶梯经济协议,以在可见光照射下通过氧化还原介导系统合成一些新的生物活性吡咯并[2,1- a ]异喹啉生物碱。各种各样的双键和三键,作为偶极体,用原位生成的偶氮甲碱叶立德处理以制备相应的产品,产率很好。这种不含金属的方法使用双有机染料作为假氧化还原介导系统,有效地促进了氧化/[3+2]环加成/氧化/芳构化多米诺反应,无需进一步的氧化剂。此外,对于大多数产物,产物沉淀很容易从反应介质中分离出来。据我们所知,这是双染料作为伪氧化还原介导系统的第一份报告.
External oxidant-free oxidation/[3+2] cycloaddition/aromatization cascade: electrochemical synthesis of polycyclic N-heterocycles
作者:Qiang Wang、Ting Yuan、Qiang Liu、Yong Xu、Guanqun Xie、Xin Lv、Shujiang Ding、Xiaoxia Wang、Chen Li
DOI:10.1039/c9cc04336e
日期:——
Here, we describe an efficient and environmentally friendly synthesis of polycyclic N-heterocycles under electrochemical external oxidant-free conditions. The extent of the sequential electrochemical oxidativearomatization can be regulated with the assistance of redox mediators.
Diethyl Azodicarboxylate-Promoted Oxidative [3 + 2] Cycloaddition for the Synthesis of Pyrrolo[2,1-<i>a</i>]isoquinolines
作者:Ya-Wen Xu、Jiankun Wang、Guangji Wang、Le Zhen
DOI:10.1021/acs.joc.0c01567
日期:2021.1.1
A novel metal-free protocol for the effective and efficient construction of pyrrolo[2,1-a]isoquinolines via a diethyl azodicarboxylate (DEAD)-promoted oxidative [3 + 2] cycloaddition/aromatization tandem reaction is described. Instead of the reported two-component oxidation systems, DEAD, as the sole oxidant, could smoothly transfer the tertiary amines to azomethine ylides via oxidation-deprotonation
描述了一种新型的无金属方案,可通过偶氮二羧酸二乙酯(DEAD)促进的氧化[3 + 2]环加成/芳构化串联反应有效和高效地构建吡咯并[2,1- a ]异喹啉。代替已报道的二组分氧化系统,DEAD作为唯一的氧化剂,可以通过氧化-去质子串联过程将叔胺平稳地转移至偶氮甲亚胺。反应在较宽的底物范围内进行,从而产生中等至良好的分离产率的产物。
作者:Zhiyu Xie、Fei Li、Liangfeng Niu、Hongbing Li、Jincai Zheng、Ruijing Han、Zhiyu Ju、Shanshan Li、Dandan Li
DOI:10.1039/d0ob01403f
日期:——
cycloaddition–aromatization cascade was realized with N-substituted tetrahydroisoquinolines and electron-deficient olefins. Under the mild conditions, the reaction proceeded smoothly and displayed excellent functional group tolerance, affording 5,6-dihydro-pyrrolo[2,1-a]isoquinolines in good to high yields. This protocol exhibits a broad substrate scope to both N-alkyl tetrahydroisoquinolines and dipolarophile
用N-取代的四氢异喹啉和缺电子烯烃实现了高效且环保的CuBr/NHPI共催化好氧氧化[3 + 2]环加成-芳构化级联。在温和条件下,反应顺利进行,并表现出优异的官能团耐受性,以良好至高收率得到5,6-二氢-吡咯并[2,1- a ]异喹啉。该协议对N-烷基四氢异喹啉和亲偶极底物都表现出广泛的底物范围。
A general, simple and green process to access pyrrolo[2,1-a]isoquinolines using a KI/TBHP catalytic system
A novel KI/TBHP-catalyzed 1,3-dipolar cycloaddition/oxidation/aromatization cascade reaction provided a general, efficient and green access to biologically important pyrrolo[2,1-a]isoquinolines.
TBAI/TBHP-catalyzed [3 + 2]cycloaddition/oxidation/aromatization cascade and online ESI-MS mechanistic studies: synthesis of pyrrolo[2,1-<i>a</i>]isoquinolines and indolizino[8,7-<i>b</i>]indoles
作者:Shalini Nekkanti、Niggula Praveen Kumar、Pankaj Sharma、Ahmed Kamal、Fabiane M. Nachtigall、Oscar Forero-Doria、Leonardo S. Santos、Nagula Shankaraiah
DOI:10.1039/c5ra24629f
日期:——
A facile [3 + 2]cycloaddition/oxidation/aromatization cascade reaction for the synthesis of pyrrolo[2,1-a]isoquinolines and indolizino[8,7-b]indoles has been developed. This tandemapproach was accomplished by employing tert-butyl hydroperoxide (TBHP) as the environmentally benign stoichiometric oxidant, with the catalysis of non-toxic tetrabutylammonium iodide (TBAI) and isopropanol as the green solvent
已经开发了一种用于合成吡咯并[2,1- a ]异喹啉和吲哚并[8,7- b ]吲哚的简便的[3 + 2]环加成/氧化/芳构化级联反应。这种串联方法是通过使用叔丁基过氧化氢(TBHP)作为环境友好的化学计量氧化剂,并以无毒碘化四丁基碘化铵(TBAI)和异丙醇作为绿色溶剂的催化作用来实现的。令人欣慰的是,该协议具有高度的通用性,因为多环化合物的构建可以通过容易获得的双极性亲和剂进行定制。只需催化量的TBAI,因为可以就地回收高价亲电子碘(IOH)通过TBHP氧化。此外,首次通过使用ESI-MS / MS在线监测反应来拦截和表征与该级联反应有关的机理方面和推测的中间体。