One-Pot Gold-Catalyzed Aminofluorination of Unprotected 2-Alkynylanilines
摘要:
A tandem gold(I)-catalyzed aminocylization/fluorination and a two-step, one-pot gold(III)-catalyzed cyclization/electrophilic fluorination provide a convenient and general method for the synthesis of 3,3-difluoro-2-substituted-3H-indoles in good yield under mild conditions. Extension of the procedure to the synthesis of 2-aryl-3-fluoro-1H-indoles is described. The reaction proceeds smoothly in green ethanol and does not require any base, acid, or N-protective group.
2,3-Difunctionalized Indoles via Radical Acylation or Trifluoromethylation of <i>ortho</i>-Alkynylphenyl Isonitriles
作者:Dirk Leifert、Frauke Weidlich、Florin Adler、Constantin G. Daniliuc、Fatmah A. Alasmary、Armido Studer
DOI:10.1021/acs.orglett.1c03916
日期:2022.1.14
A radical cascade to 2,3-disubstituted indoles proceeding via acylation or trifluoromethylation of ortho-alkynylphenyl isonitriles is presented. In these cascades, two C–C bonds and one C–O bond are formed using an inexpensive oxidant and a catalytic copper or iron salt. The starting isonitriles are easily accessible, and commercially available aldehydes and fluoromethylation reagents serve as reaction
Syntheses of <i>N</i>-Alkyl 2-Arylindoles from Saturated Ketones and 2-Arylethynylanilines via Cu-Catalyzed Sequential Dehydrogenation/Aza-Michael Addition/Annulation Cascade
We describe here a Cu-catalyzed and 4-OH-TEMPO-mediated sequential dehydrogenation/aza-Michael addition/annulation cascade reaction for the construction of N-alkyl 2-arylindoles from facilely available saturatedketones and 2-arylethynylanilines. This reaction shows high regioselectivity and tolerates a variety of functional groups. Moreover, 3-alkyl-substituted indoles can also be achieved when using
Nucleopalladation Triggering the Oxidative Heck Reaction: A General Strategy to Diverse β-Indole Ketones
作者:Qian Wang、Liangbin Huang、Xia Wu、Huanfeng Jiang
DOI:10.1021/ol4027683
日期:2013.12.6
A simple and efficient palladium-catalyzedoxidative coupling between 2-alkynyl anilines and allylic alcohols is described by using cheap and green dioxygen as the oxidant. These cross-couplings have a large functional group tolerance and are of higher reactivity toward electron nonbaised allylic alcohols. The resultant β-indole ketones are readily converted to pharmaceutically significant β-indole
通过使用廉价的绿色双氧作为氧化剂,描述了2-炔基苯胺和烯丙基醇之间简单而有效的钯催化的氧化偶合。这些交叉偶联具有大的官能团耐受性,并且对电子非卤代烯丙基醇具有更高的反应性。所得的β-吲哚酮易于转化为具有药学意义的β-吲哚醇/胺和吡咯并[2,1- a ]异喹啉。
N-Heterocyclic carbene palladium-catalyzed cascade annulation/alkynylation of 2-alkynylanilines with terminal alkynes
A straightforward and highlyeffective N-heterocyclic carbene-palladium catalyzed cascade annulation/alkynylation of 2-alkynylanilines with terminal alkynes has been enabled to afford free (NH)-3-alkynylindole derivatives in moderate to good yields. This protocol features mild conditions, broadsubstratescope, and high atom- and step-economy. Notably, the resultant 3-alkynylindoles could be conveniently
A novel and efficient palladium-catalyzed cascade annulation/arylthiolation reaction has been developed to afford functionalized 3-sulfenylbenzofuran and 3-sulfenylindole derivatives in moderate to good yields from readily available 2-alkynylphenols and 2-alkynylamines in ionic liquids. This protocol provides a valuable synthetic tool for the assembly of a wide range of 3-sulfenylbenzofuran and 3-sulfenylindole