An efficient metal-free and catalyst-free C–S/C–O bond-formation strategy: synthesis of pyrazole-conjugated thioamides and amides
作者:Shubham Sharma、Dharmender Singh、Sunit Kumar、Vaishali、Rahul Jamra、Naveen Banyal、Deepika、Chandi C Malakar、Virender Singh
DOI:10.3762/bjoc.19.22
日期:——
described for the synthesis of pyrazole-tethered thioamide and amide conjugates. The thioamides were generated by employing a three-componentreaction of diverse pyrazole C-3/4/5 carbaldehydes, secondary amines, and elemental sulfur in a single synthetic operation. The advantages of this developed protocol refer to the broad substrate scope, metal-free and easy to perform reaction conditions. Moreover
A Simple and Efficient Synthesis of Ethyl 1-Aryl-4-formyl-1<i>H</i>-pyrazole-3-carboxylates
作者:Vasyl S. Matiychuk、Mykhaylo A. Potopnyk、Mykola D. Obushak
DOI:10.1002/jhet.1042
日期:2013.2
A new simple and convenient method of synthesis of ethyl 1-aryl-4-formyl-1H-pyrazole-3-carboxylates from aromatic amines via diazonium salts has been developed. Hydrolysis and hydrazinolyization of these compounds has been investigated.
Synthesis of 2H-Thiopirano[3,4-c]pyrazol-7-one Derivatives as the First Example a New Heterocyclic System
作者:T. I. Chaban、Y. E. Matiichuk、V. S. Matiychuk
DOI:10.1134/s1070363220070257
日期:2020.7
rhodanine. Under the action of NaOH, the prepared pyrazole-3-carboxylates underwent recyclization to form 2-aryl-7-oxo-2,7-dihydrothiopyrano[3,4-c]pyrazole-5-carboxylic acids—the first representatives of new heterocyclic system.
摘要结果获得了一系列的4-[(Z)-(4-氧代-2-硫代氧代-1,3-噻唑烷-5-亚甲基)甲基] -1-芳基-1 H-吡唑-3-羧酸乙酯4-甲酰基-1-芳基-1 H-吡唑-3-羧酸乙酯与若丹宁的反应 在NaOH的作用下,制得的吡唑-3-羧酸酯经过再循环形成2-芳基-7-氧代-2,7-二氢硫代吡喃并[3,4- c ]吡唑-5-羧酸,这是新杂环的第一个代表系统。