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Wang Z.,CAS Changchun Institute of Applied Chemistry | Bi X.,Northeast Normal University | Bi X.,Institute of Elemento Organic Chemistry | Liao P.,Northeast Normal University | And 4 more authors.
Chemical Communications | Year: 2012

A catalytic and highly efficient Wolff's cyclocondensation of α-diazoketones with aromatic and aliphatic amines has been realized for the first time by utilizing the strategy of an intramolecular hydrogen bonding-activating carbonyl group. This approach successfully solved the challenging problem of poor condensation efficiency in Wolff 1,2,3-triazole synthesis, and constitutes a powerful method for the synthesis of highly functionalized 1,2,3-triazoles. © The Royal Society of Chemistry 2012. Source


Meng X.,Northeast Normal University | Liao P.,Northeast Normal University | Liu J.,Northeast Normal University | Bi X.,Northeast Normal University | Bi X.,Institute of Elemento Organic Chemistry
Chemical Communications | Year: 2014

Divergent syntheses of indolizines and 2,4-disubstituted pyrroles by the silver-catalyzed cyclization of 2-pyridyl alkynyl carbinols with isocyanides are reported. These methods provide an effective route to highly functionalized indolizines and 2,4-disubstituted pyrroles in good to excellent yields. The 2,4-disubstituted pyrroles are synthesized by an unprecedented regioselective [3+2] cycloaddition of terminal alkynes with isocyanides. © 2014 the Partner Organisations. Source


Xie J.-N.,Institute of Elemento Organic Chemistry | Yu B.,Beijing Institute of Technology | Guo C.-X.,Institute of Elemento Organic Chemistry | He L.-N.,Institute of Elemento Organic Chemistry | He L.-N.,Nankai University
Green Chemistry | Year: 2015

An efficient method for the synthesis of 3a-hydroxyisoxazolo[3,2-a]isoindol-8(3aH)-ones from CO2, terminal alkynes, EtBr, and NHPI (N-hydroxyphthalimide) was developed through a tandem carboxylation/annulation strategy catalyzed by a copper(i)/phosphine system. This one-pot multicomponent reaction was conducted at atmospheric CO2 pressure to afford the target products in good to excellent yields under mild conditions. Notably, a wide range of functional groups were tolerated in this procedure. This protocol with simultaneous formation of four novel bonds i.e. two C-C bonds and two C-O bonds represents an efficient methodology for upgrading CO2 into heterocycles. © The Royal Society of Chemistry 2015. Source


Liu X.,Institute of Elemento Organic Chemistry | Zhang S.,Institute of Elemento Organic Chemistry | Song Q.-W.,Institute of Elemento Organic Chemistry | Liu X.-F.,Institute of Elemento Organic Chemistry | And 4 more authors.
Green Chemistry | Year: 2016

A bifuncational catalytic system consisting of CaBr2 and 1,8-diazabicyclo[5.4.0]-undec-7-ene (DBU) was developed for the efficient fixation of CO2 with epoxides to cyclic carbonates. Such a dual catalysis facilitates the reaction to proceed smoothly at atmospheric CO2 pressure, presumably due to the simultaneous activation of CO2 by DBU and epoxides by CaBr2. In addition, the activation role of CaBr2 was also studied using density functional theory (DFT) calculations. A plausible mechanism involving the DBU-CO2 adduct-assisted ring opening path and the bromide anion-promoted ring opening path is proposed, in combination with the activation of epoxides by the calcium cation. This process represents a simple, cost-effective and biocompatible route to obtain cyclic carbonates from CO2 under mild conditions, especially at atmospheric CO2 pressure. © 2016 The Royal Society of Chemistry. Source


Shang J.,Yantai University | Sun R.,Institute of Elemento Organic Chemistry | Li Y.,Institute of Elemento Organic Chemistry | Huang R.,Institute of Elemento Organic Chemistry | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2010

A series of novel N-tert-butyl-N-thio[1-(6-chloro-3-pyridylmethyl)-2- nitroiminoimidazolidine]-N,N′-diacylhydrazines were synthesized by the reaction of chlorosulfenyl(N-tert-butyl-N,N′-diacylhydrazines) with 1-(6-chloro-3-pyridylmethyl)-2-nitroiminoimidazolidine (imidacloprid) in the presence of sodium hydride. Their larvicidal activities were evaluated. All of them exhibited insecticidal activities against Oriental armyworm and bean aphids. Toxicity assays indicated that at higher concentrations (200 mg L -1) the title compounds can kill aphids as fast as the parent imidacloprid in 2 h, whereas at lower concentration (10 mg L-1), the title compounds can induce a premature, abnormal and lethal larval moult after 3 days of treatment, like the parent diacylhydrazines. ©2009 American Chemical Society. Source

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