Diiiodine/Potassium Persulfate Mediated Synthesis of 1,2,3-Thiadiazoles from N-Tosylhydrazones and a Thiocyanate Salt as a Sulfur Source under Transition-Metal-Free Conditions
作者:Yadong Sun、Ablimit Abdukader、Yuhan Lu、Chenjiang Liu
DOI:10.1055/a-1473-7369
日期:2021.6
efficient method for the synthesis of 1,2,3-thiadiazoles has been developed by utilizing readily available tosylhydrazones and ammonium thiocyanate with ecofriendly EtOH as the solvent at room temperature. The reaction shows a wide scope of substrates and good functional-group tolerance. This protocol can be scaled up to a gram level and can be applied to coupling reactions with 4-(4-bromophenyl)-1
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
A bioinspired two-component redox organocatalyst system using 1,10-bridged flavinium and NH4I was developed to perform environmentally friendly aerobic oxidative ring formation of 1,2,3-thiadiazoles from N-tosylhydrazones and sulfur. The redox organocatalysis of the flavinium promoted the iodine-catalyzed system without the use of any sacrificial reagents, except for environmentally benign molecular
A comonomer comprising:
wherein W is selected from the group consisting of: S, Se, O, and N-Q; and Q is selected from the group consisting of: a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring. In this comonomer, A and B are independently selected from the group consisting of: H, Br, an aryl group, and a heteroaryl group.