Indium(III) Chloride-Catalyzed Propargylation/Amination/Cycloisomerization Tandem Reaction: One-Pot Synthesis of Highly Substituted Pyrroles from Propargylic Alcohols, 1,3-Dicarbonyl Compounds and Primary Amines
propargylation/amination/cycloisomerization tandem process has been developed for the synthesis of highly substituted pyrroles derivatives from propargylic alcohols, 1,3-dicarbonylcompounds and primary amines using indium(III) chloride as a multifunctional catalyst. This method provides a flexible and rapid route to substituted pyrroles.
Ring-contraction of hantzsch esters and their derivatives to pyrroles <i>via</i> electrochemical extrusion of ethyl acetate out of aromatic rings
作者:Xu Liu、Chang Liu、Xu Cheng
DOI:10.1039/d1gc00487e
日期:——
ring-contraction of HEs and theirs pyridinederivatives is developed to obtain polysubstituted pyrroles. This process provides an orthogonal utilization of Hantzsch esters for the well-documented application as side chain or hydrogen donors. The formal transformation shows an extrusion of ethyl acetate out of the pyridine ring in a single step. In addition to the novel transformation, we also discovered the Lewis
Several tetrasubstituted NH pyrroles, functionalized with ester or ketone groups at C-3 position, were prepared by one-pot coupling of secondarypropargylicalcohols with 1,3-dicarbonylcompounds and tert-butyl carbamate, via in situ deprotection of the corresponding pentasubstituted N-Boc pyrroles. The three-component coupling process was promoted by the combined use of the 16-electron ruthenium(II)
Chemo‐Enzymatic Synthesis of Pyrazines and Pyrroles
作者:Jin Xu、Anthony P. Green、Nicholas J. Turner
DOI:10.1002/anie.201810555
日期:2018.12.17
Herein we report the biocatalytic synthesis of substituted pyrazines and pyrroles using a transaminase (ATA) to mediate the key amination step of the ketone precursors. Treatment of α-diketones with ATA-113 in the presence of a suitable amine donor yielded the corresponding α-amino ketones which underwent oxidative dimerization to the pyrazines. Selective amination of α-diketones in the presence of
Iron-Catalyzed Tandem One-Pot Addition and Cyclization of the Blaise Reaction Intermediate and Nitroolefins: Synthesis of Substituted NH-Pyrroles from Nitriles
The iron‐catalyzed addition and cyclization of the Blaisereactionintermediate and nitroolefins to synthesize highly functionalized NH‐pyrroles in a tandem one‐pot manner fromnitriles has been developed. This reaction shows good functional group tolerance and affords a broad spectrum of substituted NH‐pyrroles in good yields.