Spectral studies of multi-branched fluorescence dyes based on triphenylpyridine core
摘要:
A series of novel triphenylpyridine-containing triphenylamine derivatives have been carefully designed and prepared in good yields using the stepwise route reactions. The relationship of photoluminescence property and structure of compounds 9-13 was systematically investigated via UV-vis, fluorescence, thermogravimetric and electrochemical analyzer. The highest occupied molecular orbital and the lowest unoccupied molecular orbital distributions of compounds 9-13 were calculated by density functional theory method. The high fluorescence quantum yields, desirable the highest occupied molecular orbital levels and high thermal stability of compounds 9-13 indicate that the linkage of triphenylpyridine and triphenylamine is an efficient means to enhance hole-transporting ability and fluorescent quantum yield. (C) 2013 Elsevier B.V. All rights reserved.
N-Heterocyclic Carbene-Catalysed Mukaiyama–Michael Reaction and Mukaiyama Aldol/Mukaiyama–Michael Three-Component Coupling Reaction
作者:Kim Nguyen、David W. Lupton
DOI:10.1071/ch16566
日期:——
ethers and chalcone derivatives has been discovered. In addition, a related reactioncascade involving dehydrative Mukaiyamaaldol followed by a Mukaiyama–Michael addition process has been developed. The later reaction can also be achieved as a three-component coupling reaction. The enantioselective variant of these reactions has been examined with homochiral catalysts. Though these catalysts were active
Unexpected synthesis of 1,3,5-triarly-1,5-diketones from aryl ketones via di-enamine mechanism
作者:Bin Liu、Junfeng Wang、Yi Pang、Zemei Ge、Runtao Li
DOI:10.1016/j.tet.2014.10.009
日期:2014.12
An unexpected reaction of arylketone with acetohydrazone of aromatic aldehyde via 1,2-di-enamine/di-iminium mechanism was discovered, leading to efficient synthesis of 1,3,5-triaryl-1,5-diketones in good to excellent yields.
A Novel Formation of Phenyl-Substituted Pyridines by the Reaction of<i>N</i>-(Diphenylphosphinyl)-1-azaallyl Anions with α,β-Unsaturated Carbonyl Compounds. A New Synthetic Equivalent of Primary Vinylamines
1-propanone and 1,5-pentanedione derivatives. A plausible mechanism involving a sequence of Michael addition and intramolecular aza-Horner-Wittig reaction is described, and the 1-azaallyl anions were found to behave as a synthetic equivalent of primaryvinylamines.
The synthesis of 2-aroyl-3,5-diarylthiophenes has been achieved from various 1,5-diketones with elemental sulphur and morpholine under microwave irradiation following a greener protocol.
Carbon–Carbon Bond Cleavage Reaction: Synthesis of Multisubstituted Pyrazolo[1,5-<i>a</i>]pyrimidines
作者:Pallabi Saikia、Sanjib Gogoi、Romesh C Boruah
DOI:10.1021/acs.joc.5b00933
日期:2015.7.2
A newcarbon–carbonbond cleavage reaction was developed for the efficientsynthesis of multisubstituted pyrazolo[1,5-a]pyrimidines. This base induced reaction of 1,3,5-trisubstituted pentane-1,5-diones and substituted pyrazoles afforded good yields of the pyrazolo[1,5-a]pyrimidines.
为了有效合成多取代的吡唑并[1,5- a ]嘧啶,开发了一种新的碳-碳键裂解反应。该碱诱导的1,3,5-三取代戊烷-1,5-二酮与取代的吡唑的反应提供了吡唑并[1,5- a ]嘧啶的良好收率。