Synthesis, characterization, antiamoebic activity and cytotoxicity of novel 2-(quinolin-8-yloxy) acetohydrazones and their cyclized products (1,2,3-thiadiazole and 1,2,3-selenadiazole derivatives)
1,2,3-selenadiazole derivatives were synthesized by the cyclization of novel 2-(quinolin-8-yloxy) acetohydrazones. In vitro antiamoebic activity was performed against HM1: IMSS strain of Entamoeba histolytica. The results showed that all the 2-(quinolin-8-yloxy) acetohydrazones were more active than their cyclized products (1,2,3-thiadiazole and 1,2,3-selenadiazole derivatives). SAR showed that the
Ionic Liquid as Soluble Support for Synthesis of 1,2,3-Thiadiazoles and 1,2,3-Selenadiazoles
作者:Anil Kumar、Manoj Kumar Muthyala、Sunita Choudhary、Rakesh K. Tiwari、Keykavous Parang
DOI:10.1021/jo301607a
日期:2012.10.19
3-selenadiazoles was achieved using an ionic liquid as a novel soluble support. Ionic liquid-supported sulfonyl hydrazine was synthesized and reacted with a number of ketones to afford the corresponding ionic liquid-supported hydrazones that were converted to 1,2,3-thiadiazoles in the presence of thionylchloride. The reaction of ionic liquid-supported hydrazones with selenium dioxide in acetonitrile afforded
作者:Armin J. Mayr、Benjamin Carrasco-Flores、Francisco Cervantes-Lee、Keith H. Pannell、László Párkányi、Krishan RaghuVeer
DOI:10.1016/0022-328x(91)86290-7
日期:1991.3
Reactions of substituted 1,2,3-selena- and thia-diazoles with (η5-C5H4R)Mn(CO)2THF, R H, Me, lead to isolable blue complexes in which THF is replaced by the diazole ligand. The X-ray structure of the benzothiadiazole complex is reported and shows the intact diazole bonded via N2 to manganese. Ab initio calculations on 1,2,3-thiadiazole generated a structure and protonation energies that confirm N2
It was found that the reaction of 1,2,3-selenadiazoles derived from cyclic ketones with olefins or dienes was markedly promoted by a catalytic amount of tributylstannyl radical, which was generated in situ from tributylstannyl hydride or allyltributylstannane and AIBN, to give the corresponding dihydroselenophenes in moderate to good yields. In contrast, when 1,2,3-selenadiazoles prepared from linear
Synthesis and characterisation of cyclopentadienylcobalt and pentamethylcyclopentadienylcobalt diselenolenes
作者:Christopher P. Morley、Richard R. Vaughan
DOI:10.1039/dt9930000703
日期:——
Reaction of [Co(C5R15)(CO)2] (R1 = H or Me) with 1,2,3-selenadiazoles in toluene under reflux in the presence of an excess of elemental selenium leads in moderate yield to the diselenolenes [Co(C5R15)SeC(R2)=C(R3)Se}] [R2-R3=(CH2)6, CH=CH(CH2), or CH=CH(CH2)2CH=CH; R2=Ph, R3=H; R2=R3=Ph]. In particular this procedure provides access to novel compounds without electron-withdrawing substituents. The products have been characterised by H-1 NMR, IR, UV/VIS and mass spectroscopy, microanalysis and cyclic voltammetry. Each diselenolene undergoes a fully reversible one-electron reduction, and exhibits a low-energy electronic transition at ca. 800 nm. Of the substituents (R1,R2,R3), R1 has the greatest influence on the spectroscopic and electrochemical properties. For structurally similar compounds there is a linear correlation between the half-wave potential for the reduction and the energy of the first electronic absorption band.