An efficient synthesis of highlysubstitutedisoquinoliniumsalts from ketimines and alkynes via a Rh(III)-catalyzed C-H bond activation and annulation reaction is described.
Modular Synthesis of Multisubstituted Furans through Palladium-Catalyzed Three-Component Condensation of Alkynylbenziodoxoles, Carboxylic Acids, and Imines
作者:Junliang Wu、Naohiko Yoshikai
DOI:10.1002/anie.201504687
日期:2015.9.14
regiocontrolled synthesis of a multisubstitutedfuran is achieved through Pd(OAc)2‐catalyzed room‐temperature condensation of an alkynylbenziodoxole, a carboxylicacid, and an enolizable ketimine, which contribute to C1, CO, and C2 fragments, respectively, to the furan skeleton. The reaction tolerates a broad range of functional groups in each of the reaction components, and enables highly modular and flexible
The condensation of deoxybenzoin, phenylacetone, dibenzylketone and ethyl phenyl ketone with primary aromatic amines results in imines, which tautomerize partially in solution with measurable rate to the corresponding enamines. The condensation with methylamine produces instantly the isomer composition. In several cases the imines show syn-anti-isomerism. The structural dependence of the imine-enamine-equilibrium
Copper-catalyzed condensation of imines and α-diazo-β-dicarbonyl compounds: modular and regiocontrolled synthesis of multisubstituted pyrroles
作者:Wei Wen Tan、Naohiko Yoshikai
DOI:10.1039/c5sc02322j
日期:——
In the presence of a copper(II) catalyst, enolizable imines bearing various N-substituents and α-diazo-β-ketoesters undergo denitrogenative and dehydrative condensation to afford highly substituted pyrroles in moderate to good yields with exclusive regioselectivity. The reaction likely involves nucleophilic addition of the imine nitrogen to a copper carbenoid, tautomerization of the resulting azomethine
Catalyst-free synthesis of tetrahydropyrimidines <i>via</i> formal [3+3]-cycloaddition of imines with 1,3,5-hexahydro-1,3,5-triazines
作者:Long Chen、Kai Liu、Jiangtao Sun
DOI:10.1039/c7ra11973a
日期:——
tetrahydropyrimidines from readily available starting materials has been developed. This process features an unprecedented intermolecular formal [3+3]-annulation of imines and 1,3,5-hexahydro-1,3,5-triazines under catalyst-free conditions. Importantly, differing from previous transformations, the 1,3,5-triazines are firstly utilized as formal 1,3-dipoles in cycloadditionreactions.