Rhodium-catalyzed C4aryl-H activation and ring-retentive annulation of 2H-imidazoles with internal alkynes to build imidazo[5,1-a]isoquinolinium salts with high yields and broad scope has been disclosed.These novel sa...Rhodium-catalyzed C4aryl-H activation and ring-retentive annulation of 2H-imidazoles with internal alkynes to build imidazo[5,1-a]isoquinolinium salts with high yields and broad scope has been disclosed.These novel salts serve as new full-color emissive fluorophores(433-633 nm),just by simply modifying the substituents on C3 and C4 positions of isoquinoline ring.Furthermore,these salts can undergo ring-opening C5_(aryl)-H activation/annulation with a different alkyne to form non-symmetric and AIE-active1,1-biisoquinolines,where NH_(4)OAc plays an indispensable role that accounts for Hofmann elimination and imine formation,leading to an unprecedented imine dance:cyclic imine→N-alkenyl imine→NH imine.The15N labelling experiments indicate that the 2ndannulation includes two pathways:N-exchange(major)and N-retention(minor).展开更多
The new chromium （VI） oxidizing reagent isoquinolinium bromochromate （IQBC） was prepared and characterized. The IQBC has been found to be stable and an efficient solid reagent which can be easily prepared in good ...The new chromium （VI） oxidizing reagent isoquinolinium bromochromate （IQBC） was prepared and characterized. The IQBC has been found to be stable and an efficient solid reagent which can be easily prepared in good yield. It act as an efficient brominating reagent for hydroxylated aromatic compounds as well as good oxidizing reagent for the conversion of alcohols to carbonyl compounds in good to excellent yield. The synthesized isoquinolinium bromochromate is more ideal reagent, with number of specification including： higher yield, mild conditions and easy preparation. The results obtained with isoquinolinium bromochromate are satisfactory and suggest that the reagent has few advantages over the existing chromium （VI） reagents.展开更多
facile one-step method is presented for the synthesis of indolizines in moder-ate to high yields by reaction of pyridinium, quinolinium and isoquinolinium ylideswith acrylonitrile, methyl acrylate and diethyl maleate ...facile one-step method is presented for the synthesis of indolizines in moder-ate to high yields by reaction of pyridinium, quinolinium and isoquinolinium ylideswith acrylonitrile, methyl acrylate and diethyl maleate respectively in the presenceof tetrakis-pyridino-cobalt(Ⅱ)dichromate (TPCD) in DMF.展开更多
A new ion-pair complex,[2-Na(Me)IQl]2[Ni(i-mnt)2],was obtained by the direct reaction of K2(i-mnt)(i-mnt=iso-maleonitriledithiolate),NiCl2·6H2O and [2-Na(Me)IQl]Br([2-Na(Me)IQl]+=1-(2′-naphthylmethyl)isoquinolin...A new ion-pair complex,[2-Na(Me)IQl]2[Ni(i-mnt)2],was obtained by the direct reaction of K2(i-mnt)(i-mnt=iso-maleonitriledithiolate),NiCl2·6H2O and [2-Na(Me)IQl]Br([2-Na(Me)IQl]+=1-(2′-naphthylmethyl)isoquinolinium) in MeOH.Its composition and structure were characterized by elemental analyses,IR,UV-VIS and single crystal X-ray diffraction.The single crystal structure analysis revealed that the complex is composed of two [2-Na(Me)IQl]+ cations and a [Ni(i-mnt)2]2-anion,and forms a network structure through C-H…N,C-H…(hydrogen bonds and π…π stacking interaction.展开更多
基金financial support from the National Natural Science Foundation of China(Nos.22261013 and 22001049)Guangxi Natural Science Foundation(No.2020GXNSFBA297003)Magneto-Chemical Functional Materials(No.EMFM20221102)。
文摘Rhodium-catalyzed C4aryl-H activation and ring-retentive annulation of 2H-imidazoles with internal alkynes to build imidazo[5,1-a]isoquinolinium salts with high yields and broad scope has been disclosed.These novel salts serve as new full-color emissive fluorophores(433-633 nm),just by simply modifying the substituents on C3 and C4 positions of isoquinoline ring.Furthermore,these salts can undergo ring-opening C5_(aryl)-H activation/annulation with a different alkyne to form non-symmetric and AIE-active1,1-biisoquinolines,where NH_(4)OAc plays an indispensable role that accounts for Hofmann elimination and imine formation,leading to an unprecedented imine dance:cyclic imine→N-alkenyl imine→NH imine.The15N labelling experiments indicate that the 2ndannulation includes two pathways:N-exchange(major)and N-retention(minor).
文摘The new chromium （VI） oxidizing reagent isoquinolinium bromochromate （IQBC） was prepared and characterized. The IQBC has been found to be stable and an efficient solid reagent which can be easily prepared in good yield. It act as an efficient brominating reagent for hydroxylated aromatic compounds as well as good oxidizing reagent for the conversion of alcohols to carbonyl compounds in good to excellent yield. The synthesized isoquinolinium bromochromate is more ideal reagent, with number of specification including： higher yield, mild conditions and easy preparation. The results obtained with isoquinolinium bromochromate are satisfactory and suggest that the reagent has few advantages over the existing chromium （VI） reagents.
文摘facile one-step method is presented for the synthesis of indolizines in moder-ate to high yields by reaction of pyridinium, quinolinium and isoquinolinium ylideswith acrylonitrile, methyl acrylate and diethyl maleate respectively in the presenceof tetrakis-pyridino-cobalt(Ⅱ)dichromate (TPCD) in DMF.
文摘A new ion-pair complex,[2-Na(Me)IQl]2[Ni(i-mnt)2],was obtained by the direct reaction of K2(i-mnt)(i-mnt=iso-maleonitriledithiolate),NiCl2·6H2O and [2-Na(Me)IQl]Br([2-Na(Me)IQl]+=1-(2′-naphthylmethyl)isoquinolinium) in MeOH.Its composition and structure were characterized by elemental analyses,IR,UV-VIS and single crystal X-ray diffraction.The single crystal structure analysis revealed that the complex is composed of two [2-Na(Me)IQl]+ cations and a [Ni(i-mnt)2]2-anion,and forms a network structure through C-H…N,C-H…(hydrogen bonds and π…π stacking interaction.
