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:Chenguang Yu、Yianan Zhang、Shilei Zhang、Hao Li、Wei Wang
DOI:10.1039/c0cc03186k
日期:——
A novel and synthetically efficient Cu(II) catalyzed oxidation-dipolar cycloaddition-aromatization cascade reaction has been developed for a "one-pot" synthesis of biologically important pyrrolo [2, 1-a] isoquinolines.
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
A ray of sunshine: The title reaction sequence using ethyl 2‐(3,4‐dihydroisoquinolin‐2(1H)‐yl)acetates with a series of electron‐deficient alkenes and alkynes provides rapid and efficient access to pyrrolo[2,1‐a]isoquinolines (see scheme; bpy=2,2′‐bipyridine, EWG=electron‐withdrawing group). The reaction offers a strategically new protocol for the direct and efficient construction of the core structure
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。
Visible-light photoredox catalyzed synthesis of pyrroloisoquinolines via organocatalytic oxidation/[3 + 2] cycloaddition/oxidative aromatization reaction cascade with Rose Bengal
作者:Carlos Vila、Jonathan Lau、Magnus Rueping
DOI:10.3762/bjoc.10.122
日期:——
Pyrrolo[2,1-a]isoquinoline alkaloids have been prepared via a visible light photoredox catalyzed oxidation/[3 + 2] cycloaddition/oxidativearomatization cascade using Rose Bengal as an organo-photocatalyst. A variety of pyrroloisoquinolines have been obtained in good yields under mild and metal-free reaction conditions.