Synthesis and platelet aggregation inhibitory activity of 4,5-bis(substituted)-1,2,3-thiadiazoles
摘要:
Routine screening of compounds for inhibition of collagen-induced platelet aggregation in vitro revealed 4,5-bis-(4-methoxyphenyl)-1,2,3-thiadiazole (2) was active and it represents the first example of a 1,2,3-thiadiazole with possible antithrombotic activity. In order to develop a structure-activity relationship for this heterocycle, a number of new 4(5)-mono- and -disubstituted 1,2,3-thiadiazoles were synthesized. These were tested in our screen and a number of additional active compounds were found. The most active compounds (2, 5a, 5b, and 6c) were those in which the heterocycle was substituted with benzene rings possessing para electron-donating groups.
Sequential One-Pot Synthesis of Tri- and Tetrasubstituted Thiophenes and Fluorescent Push–Pull Thiophene Acrylates Involving (Het)aryl Dithioesters as Thiocarbonyl Precursors
作者:Anand Acharya、G. Parameshwarappa、B. Saraiah、H. Ila
DOI:10.1021/jo502429c
日期:2015.1.2
An efficient, one-pot three component synthesis of highly functionalized tri- and tetrasubstituted thiophenes has been reported involving (het)aryl dithioesters as thiocarbonyl precursors. Thus, sequential base mediated condensation of readily available (het)aryl active methylene ketones with (het)aryl dithioesters followed by S-alkylation of the resulting enethiolate salts with activated halomethylene
Identification and Quantification of Defect Structures in Poly(2,5-thienylene vinylene) Derivatives Prepared via the Dithiocarbamate Precursor Route by Means of NMR Spectroscopy on <sup>13</sup>C-Labeled Polymers
作者:H. Diliën、S. Chambon、T. J. Cleij、L. Lutsen、D. Vanderzande、P. J. Adriaensens
DOI:10.1021/ma200228g
日期:2011.6.28
routes toward the low band gap polymerpoly(2,5-thienylenevinylene) (PTV) and derivatives have been studied. This study describes an extensive NMR characterization of 13C-labeled 3-octyl-PTV and its precursorpolymerpreparedvia the dithiocarbamate route which is, since stable monomers are available, a promising route toward PTV derivatives. By introducing 13C-labeled vinylene carbons, we were able to
Non-Acidic Mediated Friedel-Craft Reaction of Thiophene Using EtAlCl2
作者:Halil Ünver、Mutluhan Biyikoglu、Adnan Bulut
DOI:10.14233/ajchem.2013.15607
日期:——
Since alkyl Lewis acids are Brønsted bases, they give a non-acidic reaction media. In this context, acylation of thiophene is investigated in the presence of EtAlCl2 and non-acidic media. Besides 8 examples of thiophene, one example for pyrrole is synthesized in moderate to high yields (up to 99 %).
A Simple and Efficient Synthesis of Fused Benzo[b]thiophene Derivatives
作者:Alexander S. Fisyuk、Evgeny B. Ulyankin、Anastasia S. Kostyuchenko、Sergey A. Chernenko、Mikhail O. Bystrushkin、Anna L. Samsonenko、Anton L. Shatsauskas
DOI:10.1055/a-1416-4924
日期:2021.7
A new approach to the synthesis of fused benzothiophene derivatives was developed based on iodine-promoted photocyclization of 4,5-diaryl-substituted thiophenes obtained in three steps from commercially available compounds. Comparative analysis showed that photochemical cyclization is a more efficient method for the preparation of fused benzo[b]thiophene derivatives, compared to oxidative coupling
Diversity-Oriented Synthesis of Substituted Benzo[<i>b</i>]thiophenes and Their Hetero-Fused Analogues through Palladium-Catalyzed Oxidative CH Functionalization/Intramolecular Arylthiolation
作者:Anand Acharya、S. Vijay Kumar、Hiriyakkanavar Ila
DOI:10.1002/chem.201501828
日期:2015.11.16
benzo[b]thiophenes has been developed throughpalladium‐catalyzed intramolecular oxidative CH functionalization–arylthiolation of enethiolate salts of α‐aryl‐β‐(het)aryl/alkyl‐β‐mercaptoacrylonitriles/acrylates or acrylophenones. The overall strategy involves a one‐pot, two‐step process in which enethiolate salts [generated in situ through base‐mediated condensation of substituted arylacetonitriles, deoxybenzoins