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.
Cobalt-catalyzed oxidative [3 + 2] cycloaddition reactions: an efficient synthesis of pyrrolo- and imidazo-[2,1-a]isoquinolines
作者:Chengtao Feng、Ji-Hu Su、Yizhe Yan、Fengfeng Guo、Zhiyong Wang
DOI:10.1039/c3ob41424h
日期:——
A cobalt-catalyzed oxidative [3 + 2] cycloaddition cascades of dihydroisoquinoline esters with nitroolefins or N-sulfuryl aldimines were developed at room temperature. A multi-component reaction for the synthesis of 5,6-dihydroimidazo[2,1-a]isoquinolines were also realized under almost identical conditions. This method is particularly suitable for the synthesis of tricyclic nitrogen heterocycles due
在室温下开发了钴催化的二氢异喹啉酯与硝基烯烃或N-硫磺基醛亚胺的氧化[3 + 2]环加成级联反应。在几乎相同的条件下也实现了用于合成5,6-二氢咪唑并[2,1- a ]异喹啉的多组分反应。该方法操作简单,反应底物范围广,区域选择性好,因此特别适合于合成三环氮杂环。
Iron‐catalyzed oxidative [3+2] cycloaddition‐aromatization cascade: Synthesis of pyrrolo‐[2,1‐<scp><i>a</i></scp>]isoquinolines
作者:Wen Jing Hu、Na na Liu、Abudureheman Wusiman
DOI:10.1002/jhet.4669
日期:2023.9
An iron-catalyzed approach was described for the synthesis of pyrrolo[2,1-a]isoquinolines via oxidative [3+2] cycloaddition-aromatization reaction using “aqueous tert-butyl hydroperoxide (T-HYDRO)” as an oxidant. The cascade reaction proceeds well with a broad substrate scope at room temperature in a short time and generates “desired products in moderate to high yields.”
Iodine-Catalyzed 1,3-Dipolar Cycloaddition/Oxidation/Aromatization Cascade with Hydrogen Peroxide as the Terminal Oxidant: General Route to Pyrrolo[2,1-<i>a</i>]isoquinolines
We report a novel molecular iodine-catalyzed 1,3-dipolar cycloaddition/oxidation/aromatization cascade process with hydrogen peroxide as the terminal oxidant for the construction of pyrrolo[2,1-a]isoquinolines. The product pyrrolo[2,1-a]isoquinolines were obtained from reactions between simple, readily available dipolarophiles and tetrahydroisoquinolines in moderate to excellent yields without the need for a metal catalyst.