Pt-catalyzed cyclization/migration of propargylic alcohols for the synthesis of 3(2H)-furanones, pyrrolones, indolizines, and indolizinones
摘要:
Several heterocycles such as furanones, pyrrolones, and indolizines, which are of pharmacological importance, are easily accessed via the Pt(II)-catalyzed heterocyclization/1,2-migration of propargylic ketols or hydroxy imine derivatives. This method sidesteps the challenges of traditional heteroaromatic oxygenation strategies such as regioselectivity and functional group tolerance in the syntheses of these heterocycles. (C) 2008 Elsevier Ltd. All rights reserved.
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.
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 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.
Base-Controlled Cu-Catalyzed Tandem Cyclization/Alkynylation for the Synthesis of Indolizines
作者:Kyung Hwan Oh、Seong Min Kim、Sun Young Park、Jin Kyoon Park
DOI:10.1021/acs.orglett.6b00821
日期:2016.5.6
A base-controlled Cu-catalyzed tandem cyclization/alkynylation of propargylic amines provides rapid access to functionalized indolizine derivatives under mild reaction conditions. The reaction first proceeded via a 5-endo-dig aminocupration, followed by a coupling between the copper bound intermediate and alkynyl bromide, to afford the products in good to excellent yields. The successful tandem reaction is attributed to the unique property of the bases, DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) and MTBD (7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene used).
Palladium-Catalyzed Carbonylative Cyclization/Arylation Cascade for 2-Aroylindolizine Synthesis
作者:Zhou Li、Dmitri Chernyak、Vladimir Gevorgyan
DOI:10.1021/ol302947r
日期:2012.12.7
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.