Symmetrical and non-symmetrical 2,5-diaryl-1,3,4-oxadiazoles: synthesis and photophysical properties
作者:Codruţa C. Paraschivescu、Niculina D. Hădade、Anca G. Coman、Arnaud Gautier、Federico Cisnetti、Mihaela Matache
DOI:10.1016/j.tetlet.2015.05.005
日期:2015.6
We report herein the synthesis of 2,5-diaryl-1,3,4-oxadiazoles containing both electron-donating and withdrawing substituents as well as bis- and tris-2,5-disubstituted-1,3,4-oxadiazoles containing electron-donating substituents. The photophysical properties of the synthesized compounds were studied using UV–Vis and fluorescence spectroscopy. The aryl substitution pattern was found to have a marked
An Aldehyde Responsive, Cleavable Linker for Glucose Responsive Insulins
作者:Karin Mannerstedt、Narendra Kumar Mishra、Ebbe Engholm、Morten Lundh、Charlotte S. Madsen、Philip J. Pedersen、Priska Le‐Huu、Søren L. Pedersen、Nina Buch‐Månson、Björn Borgström、Thomas Brimert、Lisbeth N. Fink、Keld Fosgerau、Niels Vrang、Knud J. Jensen
DOI:10.1002/chem.202004878
日期:2021.2.10
by pH‐controlled acylations providing GRIs with glucose responsiveness confirmed in vitro for thiazolidines. Clamp studies showed increased glucose infusion at hyperglycemic conditions for one GRI indicative of a true glucose response. The glucose responsive cleavable linker in these GRIs allow changes in glucose levels to drive the release of active insulin from a circulating depot. We have demonstrated
An efficient one-pot synthesis of 2,5-disubstituted-1,3,4-thiadiazoles from aldehydes and hydrazides using Lawesson’s reagent
作者:Inseok Ko、Soojin Park、Goeun Lee、Hakwon Kim
DOI:10.24820/ark.5550190.p010.871
日期:——
important and prevalent scaffold in the development of novel leads in medicinal chemistry for a variety of therapeutic targets. A two-step, onepot synthesis of 2,5-disubstituted-1,3,4-thiadiazole derivatives from aryl hydrazides and aryl aldehydes using Lawesson’s reagent is described, yielding 2,5-disubstituted-1,3,4-thiadiazoles in moderate-to-high yields. Based on preliminary biological experiments
Efficient oxidative cyclization of <i>N</i>-acylhydrazones for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles using <i>t</i>-BuOI under neutral conditions
作者:Peng Gao、Yunyang Wei
DOI:10.1515/hc-2012-0179
日期:2013.4.1
in situ from t-BuOCl and NaI. A variety of 2,5-disubstituted1,3,4-oxadiazoles were synthesized in high yields within short reaction time. The method is also suitable for cyclization of N-acylhydrazones derived from heterocyclic aldehydes and aliphatic aldehydes. Mild reaction conditions and simple workup operations make the procedure a good alternative for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles
Electrochemical oxidation of aldehyde-N-arylhydrazones into symmetrical-2,5-disubstituted-1,3,4-oxadiazoles
作者:Sushma Singh、Laxmi K. Sharma、Apoorv Saraswat、Ibadur R. Siddiqui、Rana K. Pal Singh
DOI:10.1007/s11164-012-1013-z
日期:2014.3
A convenient, efficient and one-pot synthesis of chemically and pharmaceutically interesting symmetrical-2,5-disubstituted-1,3,4-oxadiazoles is reported. The protocol involves anodic oxidation of aldehyde-N-arylhydrazones in anhyd. MeCN–LiClO4. Constant potential electrolysis carried out in an undivided cell and platinum electrodes leads to the formation of the corresponding oxadiazoles under ambient condition and the mechanism was deduced from voltammetry studies. The reaction proceeded smoothly with high atom economy.