5528-53-0

Upstream product

• 85957-46-6 N-pyridin-2-yl-N'-thiophen-2-ylmethylene-hydrazine 
• 4930-98-7 pyrid-2-ylhydrazine 
• 4075-59-6 2-thiopheneglyoxylic acid 
• 98-03-3 thiophene-2-carbaldehyde 
• 3437-95-4 2-Iodothiophene 
• 274-80-6 [1,2,4]triazolo[4,3-a]pyridine 
• 527-72-0 2-thiophenylcarboxylic acid 

Relevant academic research and scientific papers

KI-catalyzed oxidative cyclization of α-keto acids and 2-hydrazinopyridines: Efficient one-pot synthesis of 1,2,4-triazolo[4,3-a] pyridines

A one-pot approach to substituted 1,2,4-triazolo[4,3-a]pyridines has been developed that is based on a KI-catalyzed oxidative cyclization of α-keto acids and 2-hydrazinopyridines. This transition-metal-free procedure was highly efficient and shows good economical and environmental advantages.

[1,2,4]-triazol [4,3-a] pyridines compound and synthesis method thereof

The invention discloses a [1,2,4]-triazol [4,3-a] pyridines compound and a synthesis method thereof. The compound has a structure general formula shown as the formula (I), wherein R1 is selected fromaryl and heterocyclic groups; R2 is selected from hydrogen, alkyl, alkoxy, halogen or aryl. According to the synthesis method, alpha-ketonic acid and 2-hydrazinopyridine are used as raw materials; KIis used as a catalyst; Na2CO3 is used as alkali; TBHP is used as an oxidizing agent; 1,4-dioxane is used as a solvent; after a series of serial connection cyclization and decarboxylation aromatization, the [1,2,4]-triazol [4,3-a] pyridines compound is obtained. The [1,2,4]-triazol [4,3-a] pyridines compound is prepared under the condition of no transition metal and has the advantages that the reaction is efficient and fast; the conditions are mild; the substrate is simple and can be easily obtained; the applicability is wide; the reaction time is short; the yield is high, and the like; meanwhile, the post treatment of the reaction is simple and convenient; the harm to experiment operators is reduced; the environment-friendly effect is achieved; the green chemical requirements are met.

A Convenient One-Pot Synthesis of Triazolopyridine and Related Heterocycle Fused-Triazole Analogs Through Copper Catalyzed Oxidative Cyclization Strategy

One-pot synthesis of heterocycle fused-triazole analogs from the corresponding aldehydes and heteroarylhydrazines is demonstrated. Transformation of hydrazones to the desired systems was achieved by employing the oxidative cyclization with catalytic CuBr2 and oxone. This reaction condition is mild and selective, and a wide range of functional groups were able to sustain. An array of biologically important triazolopyridines, triazolopyridazines, triazolopyrimidines, and triazoloquinolines were obtained in fairly good yield.

Cu-catalysed direct C-H (hetero)arylation of [1,2,4]triazolo[4,3-a]pyridine to construct deep-blue-emitting luminophores

Cu-catalysed direct C-H (hetero)arylation of [1,2,4]triazolo[4,3-a]pyridine has been accomplished for the first time to streamline the synthesis of 3-aryl-[1,2,4]triazolo[4,3-a]pyridines for screening blue-emitting materials. On this basis, the photophysi

An environmentally benign and solvent-free synthesis of 3-aryl[1,2,4]triazolo[4,3-a]pyridines and 1-aryl-5-methyl[1,2,4]triazolo[4,3-a] quinolines using phenyliodine bis(trifluoroacetate) or iodobenzene diacetate

A simple, solvent-free and effective method for oxidative cyclization of 2-pyridyl- and 2-quinolylhydrazones with phenyliodine bis(trifluoroacetate) and iodobenzene diacetate to the corresponding 3-aryl[1,2,4]triazolo[4,3-a]pyridines and 1-aryl[1,2,4]tria

Hypervalent iodine mediated synthesis of 1-aryl/hetryl-1,2,4-triazolo[4,3-a] pyridines and 1-aryl/hetryl 5-methyl-1,2,4-triazolo[4,3-a]quinolines as antibacterial agents

Oxidation of 2-pyridyl and 2-quinylhydrazones with iodobenzene diacetate (IBD) in dichloromethane yield 1-aryl/hetryl-1,2,4-trizolo-[4,3-a] pyridines (3a-f) and 1-aryl/hetryl-5-methyl-1,2,4-triazolo[4,3-a] quinolines (6a-f). Seven compounds were tested in