Pt-Catalyzed Cyclization/1,2-Migration for the Synthesis of Indolizines, Pyrrolones, and Indolizinones
摘要:
Indolizine, pyrrolone, and indolizinone heterocycles are easily accessed via the Pt(II)-catalyzed cycloisomerization or a tandem cyclization/1,2-migration of pyridine propargylic alcohols and derivatives. This method provides an efficient synthesis of highly functionalized heterocycles from readily available substrates.
Palladium-Catalyzed Carbonylative Cyclization/Arylation Cascade for 2-Aroylindolizine Synthesis
摘要:
An efficient synthesis of densely substituted 2-aroylindolizines via the palladium-catalyzed carbonylative cyclization/arylation is reported. This transformation proceeds via the 5-endo-dig cyclization of 2-propargylpyridine triggered by an aroyl Pd complex. It produced diversely substituted 2-aroylindolizines in good to excellent yields.
An efficient two-component palladium-catalyzed arylation/cyclizationcascadeapproach toward a variety of N-fused pyrroloheterocycles has been developed. This transformation proceeds via the palladium-catalyzed coupling of aryl halides with propargylic esters or ethers followed by the 5-endo-dig cyclization leading to highly functionalized pyrroloheterocycles in good to excellent yield.
一种有效的双组分钯催化芳基化/环化级联方法已被开发用于各种 N 稠合吡咯杂环。这种转化通过芳基卤化物与炔丙酯或醚的钯催化偶联进行,然后进行 5 - end -dig环化,产生高度官能化的吡咯杂环,收率良好至极好。
Synthesis of Indolizine Derivatives Triggered by the Oxidative Addition of Aroyl Chloride to Pd(0) Complex
作者:Yahui Li、Wei Xiong、Zhifeng Zhang、Tongyu Xu
DOI:10.1021/acs.joc.0c00161
日期:2020.5.15
An efficientsynthesis of indolizine derivatives from propargylic pyridines and aroyl chlorides was developed. The 5-endo-dig cyclization was initiated by the in situ formed acylpalladium species from the facile oxidative addition of aroyl chloride to Pd(0) complex. This transformation successfully occurred in the presence of an N-nucleophilic moiety and acid chlorides, a good electrophilic partner
Palladium-Catalyzed Difunctionalization of Alkenes by Relay Coupling with Propargylic Pyridines: Synthesis of Indolizine and Indolizinone-Containing Bisheterocycles
作者:Xiao Xiao、Puren Han、Huiwen Zhou、Jianchao Liu
DOI:10.1021/acs.joc.1c02438
日期:2021.12.17
Palladium-catalyzed arylation/heteroarylation of aryl halide-tethered alkenes with propargylic pyridines has been established, which provides direct and efficient access to various oxindole, azaoxindole, dihydrobenzopyran, indole, and benzofuran-linked indolizines in good yields with a broad substrate scope and high functional group tolerance. This process enables the formation of one C–N and two C–C
Synthesis of Indolizine Derivatives by Pd-Catalyzed Oxidative Carbonylation
作者:Tongyu Xu、Howard Alper
DOI:10.1021/acs.orglett.5b02220
日期:2015.9.18
An efficientsynthesis of indolizine derivatives by palladium-catalyzed oxidative carbonylation of propargylic pyridines has been developed. The reaction can be conducted at room temperature and under 3 bar of CO in the presence of Pd2(dba)3 or Pd/C. The catalyst Pd/C could be easily removed from the reaction and recycled.