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.
treated with in situ generated azomethine ylides to prepare corresponding products in good to excellent yields. This metal-free method effectively promoted oxidation/[3 + 2] cycloaddition/oxidative/aromatization domino reaction without further oxidant using dual organic dyes as pseudo-redox mediation system. Besides, for most of the products, product precipitate was readily separated from reaction media
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.
Chlorophyll-catalyzed tandem oxidation /[3+2] cycloaddition reactions toward the construction of pyrrolo[2,1-a]isoquinolines under visible light
作者:Mehdi Koohgard、Mona Hosseini-Sarvari
DOI:10.1016/j.jphotochem.2020.112877
日期:2021.1
Chlorophyll as a green, cheap, and affordable natural pigment was used in the one-pot synthesis of pyrrolo[2,1-a]isoquinoline scaffold under visiblelight. This photocatalytic approach has handled oxidation/[3 + 2] cycloaddition/aromatization cascade reaction usingair as the final oxidant. Under this condition, a vast variety of N-substituted tetrahydroisoquinolines were treated with dipolarophiles
Synthesis of 3,4-dihydropyrrolo[2,1-a]isoquinolines based on [3+2] cycloaddition initiated by Rh2(cap)4-catalyzed oxidation
作者:Hong-Tu Wang、Chong-Dao Lu
DOI:10.1016/j.tetlet.2013.04.004
日期:2013.6
Azomethine ylides have been efficiently generated via Rh2(cap)4-catalyzed oxidation of tetrahydroisoquinoline derivatives in the presence of base. The ylides are trapped in situ via [3+2] cycloaddition with dipolarophiles and subjected to oxidativearomatization facilitated by N-bromosuccinimide to provide 3,4-dihydropyrrolo[2,1-a]isoquinoline derivatives in moderate to excellent yields.
在碱的存在下,通过Rh 2(cap)4催化的四氢异喹啉衍生物的氧化反应,可以高效地生成甲亚胺基化物。经由二极性亲和剂经[3 + 2]环加成法将其原位捕获,并通过N-溴代琥珀酰亚胺促进氧化芳构化,从而以中等至极好的收率提供3,4-二氢吡咯并[2,1- a ]异喹啉衍生物。
Sequential Photo-oxidative [3 + 2] Cycloaddition/Oxidative Aromatization Reactions for the Synthesis of Pyrrolo[2,1-<i>a</i>]isoquinolines Using Molecular Oxygen as the Terminal Oxidant
We report an efficient method for the synthesis of pyrrolo[2,1-a]isoquinolinederivatives using sequential [3 + 2] cycloaddition/oxidative aromatization reactions catalyzed by methylene blue with fluorescent light irradiation under an oxygen atmosphere. The products were obtained in moderate to good yields.
我们报告了一种有效的合成吡咯并[2,1- a ]异喹啉衍生物的方法,该方法使用连续[3 + 2]环加成/氧化芳构化反应,由亚甲基蓝在氧气气氛下用荧光灯催化。以中等至良好的产率获得产物。