Ruthenium-Catalyzed Redox-Neutral C–H Activation via N–N Cleavage: Synthesis of N-Substituted Indoles
作者:Zhenxing Zhang、Hao Jiang、Yong Huang
DOI:10.1021/ol502998n
日期:2014.11.21
The first Ru-catalyzed redox-neutral C–H activation reaction via N–N bond cleavage is reported. Pyrazolidin-3-one is demonstrated as an internally oxidative directing group that enables C–H annulation reactions with a broad scope of alkynes, including previously incompetent terminal alkynes. Pharmacologically privileged 3-(1H-indol-1-yl)propanamides were synthesized in high yields.
Selective Synthesis of 3‐(α‐Fluorovinyl)indoles and 3‐Acylindoles via the Cascade Reactions of 1‐Phenylpyrazolidinones with α,α‐Difluoromethylene Alkynes
作者:Yujie Yang、Na Li、Jie Zhao、Yuqin Jiang、Xinying Zhang、Xuesen Fan
DOI:10.1002/adsc.202100441
日期:2021.7.20
Presented herein is a selective synthesis of 3-(α-fluorovinyl)indoles and 3-acylindoles via the coupling of 1-phenylpyrazolidinones with α,α-difluoromethylene alkynes. Mechanistically, the formation of 3-(α-fluorovinyl)indoles is resulted from a cascade process including Rh(III)-catalyzed ortho-C−H bond cleavage, regioselective triple bond insertion, pyrazolidinone ring-opening, indole ring-formation
Construction of Pyridazine Analogues <i>via</i>
Rhodium-mediated C-H Activation
作者:Chao Yang、Feifei Song、Jiean Chen、Yong Huang
DOI:10.1002/adsc.201700905
日期:2017.10.25
Herein a rhodium (III)‐mediated catalysis was demonstrated for approaching the structurally divergent N,N‐bicyclic pyridazine analogues. The pyrazolidinone moiety was used to direct the ortho C−H activation and this led to a general synthesis of benzopyridazine analogues with satisfactory yields. The crucial effect of the base was illustrated in the sequential dehydration process. For mechanistic insight
Rhodium(III)-Catalyzed [4+3] Annulation of <i>N</i>-Aryl-pyrazolidinones and Propargylic Acetates: Access to Benzo[<i>c</i>][1,2]diazepines
作者:Tingfang Li、Zi Yang、Zhenyu Song、Remi Chauvin、Xiuling Cui
DOI:10.1021/acs.orglett.0c01139
日期:2020.6.5
The generation of 2,3-dihydro-benzo[c][1,2]diazepine derivatives via rhodium(III)-catalyzed [4+3] annulation of pyrazolidinones and propargylic acetates is disclosed. The reaction proceeds smoothly under relatively mild conditions from propargylic acetates as novel C3 synthons. A range of dinitrogen-fused heterocyclic compounds are readily accessed by this approach.
公开了通过铑(III)催化的吡唑烷酮和乙酸炔丙基酯的[4 + 3]环化反应生成2,3-二氢-苯并[ c ] [1,2]二氮杂卓衍生物。在相对温和的条件下,由炔丙基乙酸酯作为新型C 3合成子,可使反应平稳进行。通过该方法可以容易地获得许多二氮稠合的杂环化合物。
Selective Synthesis of Pyrazolo[1,2-<i>a</i>]pyrazolones and 2-Acylindoles via Rh(III)-Catalyzed Tunable Redox-Neutral Coupling of 1-Phenylpyrazolidinones with Alkynyl Cyclobutanols
作者:Yuanshuang Xu、Mengyang Shen、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.0c01475
日期:2020.6.19
An unprecedented divergent synthesis of pyrazolo[1,2-a]pyrazolones and 2-acylindoles via Rh(III)-catalyzed [4 + 1] or [3 + 2] annulation of 1-phenylpyrazolidinones with alkynyl cyclobutanols through redox-neutral multiple bond activation by using −NH and −OH units as directing groups is presented. Notably, different annulation reactions were selectively achieved by simply adjusting the reaction conditions
通过Rh(III)催化1-苯基吡唑烷二酮与炔基环丁醇通过氧化还原-中性多键的环化反应,空前地合成吡唑并[1,2- a ]吡唑并酮和2-酰基吲哚。提出了通过使用-NH和-OH单元作为导向基团的活化。值得注意的是,通过简单地调节反应条件选择性地实现了不同的环化反应。这些方法具有操作简单,容易获得的底物和高区域选择性/化学选择性等特点,可以在相关领域广泛应用。