在邻吲哚苯胺和重氮化合物之间进行催化剂控制的化学发散环化反应已被研究用于合成吲哚稠合的二氮杂and和喹喔啉。在Rh(III)催化剂下,反应通过游离胺辅助的C2-H活化进行,然后进行酰胺化反应,从而以高度选择性的方式生成重氮庚并[1,7- a ]吲哚。当使用Ru(II)催化剂时,反应涉及形成Ru-卡宾配合物,然后插入-NH 2基团,并通过金属茂型反应进行级联环化,通过β-氢化物消除作用制得吲哚[1,2- a]。以喹喔啉为主要产品。该策略指导模块化方法构建独特的吲哚并结合的二氮杂/喹喔啉以及吡咯并并的二氮杂/喹喔啉骨架,并具有极高的产率。
Annulation of 1-(2-Aminoaryl)pyrroles, Ethers with Elemental Sulfur To Give 1,3,6-Benzothiadiazepine Derivatives through Double C–S Bond Formation and C–O Cleavage of Ethers
作者:Jie Zhang、Chuwen Song、Linfeng Sheng、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.8b03187
日期:2019.2.15
An efficient three-component reaction of 1-(2-aminoaryl)pyrroles, ethers, and elemental sulfur for constructing N-heterocycle-fused 1,3,6-benzothiadiazepines under transition-metal-free conditions has been developed. Ethers act as both reactants and solvent in this reaction. The method proceeds efficiently over a broad range of substrates with good functional group tolerance.
C–H carbonylative reaction of N-(2-(1H-indol-1-yl)phenyl)picolinamides for the synthesis of (NH)-indolo[1,2-a]quinoxalin-6(5H)-one skeletons has been developed. Using benzene-1,3,5-triyl triformate (TFBen) as the CO source and picolinamide as the traceless directing group, various free (NH)-indolo[1,2-a]quinoxalin-6(5H)-ones were obtained in good yields (up to 88%). Additionally, a series of product derivatizations
N-(2-(1 H-吲哚-1-基)苯基)吡啶啉酰胺的钴催化直接CH羰基化反应,用于合成(NH)-吲哚[1,2 - a ]喹喔啉-6(5)H)-骨架已经开发出来。以苯甲酸1,3,5-三甲酸三乙酯(TFBen)作为CO源,并以吡啶甲酸酰胺为无痕导向基团,得到了各种游离的(NH)-吲哚并[1,2 - a ]喹喔啉-6(5 H)-。获得高产(高达88%)。另外,证明了一系列产物衍生化,并且可以通过该方案容易地构建PARP-1抑制剂C的核心片段。
Photoredox-Catalyzed Radical Cascade Reaction To Synthesize Fluorinated Pyrrolo[1,2-<i>d</i>]benzodiazepine Derivatives
作者:Guifang Lian、Jingyu Li、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.9b00937
日期:2019.7.19
A new photoredox-catalyzed cascade reaction is described to access fluorinated pyrrolo[1,2-d]benzodiazepine derivatives under mild conditions. In this process, single electron transfer (SET) between the excited state photocatalyst fac-Ir(ppy)3 and ethyl bromodifluoroacetate initiated the regioselective radical addition to a wide range of 2-(1H-pyrrol-1-yl) anilines or indol-substituted anilines, followed
描述了一种新的光氧化还原催化的级联反应,可在温和条件下获得氟化吡咯并[1,2- d ]苯并二氮杂卓衍生物。在此过程中,激发态光催化剂fac -Ir(ppy)3和溴二氟乙酸乙酯之间的单电子转移(SET)引发了区域选择性自由基加成到2-(1 H-吡咯-1-基)苯胺或吲哚的范围大取代的苯胺,然后进行另一个SET工艺和分子内酰胺化。
Efficient synthesis of pyrrolo[1,2-α]quinoxalines mediated by ethyl 2-(4-nitrophenyl)azocarboxylate
作者:Da Hye Lee、Ga Young Kim、Jinho Kim
DOI:10.1039/d2nj05259h
日期:——
The synthesis of pyrrolo[1,2-α]quinoxalines is of importance, because they possess a variety of biological activities, and interesting fluorescence/photophysical properties. Multifarious methods for the construction of pyrrolo[1,2-α]quinoxalines have been developed, but there remains no general means to exhibit broad substrate scope with high functional group tolerance under mild conditions. We report
Synthesis of Carboranylated Dihydropyrrolo[1,2-<i>a</i>]quinoxalines and Dihydroindolo[1,2-<i>a</i>]quinoxalines by BF<sub>3</sub>·OEt<sub>2</sub>-Catalyzed Heterocyclization of <i>C</i>-Formyl-<i>o</i>-carboranes and Investigation of Their Oxidation Stability
作者:Zhen-Zhen Sun、Pan Gao、Yong Yang、Tao Wang、Xiao-Jun Wu、You-Qing Wang
DOI:10.1021/acs.joc.3c02443
日期:2024.3.1
BF3·OEt2-catalyzed synthesis of carboranylated dihydropyrrolo[1,2-a]quinoxalines and dihydroindolo[1,2-a]quinoxalines in 30–99% yields is presented through the heterocyclization of various C-modified C-formyl-o-carboranes with 1-(2-aminophenyl)-pyrroles/indoles. A systematic comparative investigation of their oxidation stability in air confirmed that 4-carboranyl-4,5-dihydropyrrolo[1,2-a]quinoxaline had better
通过各种C-修饰的C-甲酰基-的杂环化,BF 3 ·OEt 2催化合成碳硼酰化二氢吡咯并[1,2- a ]喹喔啉和二氢吲哚并[1,2- a ]喹喔啉,产率30-99%邻碳硼烷与1-(2-氨基苯基)-吡咯/吲哚。对它们在空气中氧化稳定性的系统比较研究证实,4-碳硼基-4,5-二氢吡咯并[1,2- a ]喹喔啉比4-苯基类似物具有更好的稳定性。 N-乙酰基取代的碳硼酰化二氢吡咯并[1,2- a ]喹喔啉的笼式脱硼反应产生相应的7,8-硝基-碳硼烷铯盐。还实现了动力学拆分,以获得带有碳硼烷笼碳键合手性立体中心的光学纯碳硼酰化N-杂环支架。