Results 131 to 140 of about 298 (164)

Hydrazonoyl Halides Precursors to Synthesis of New Thiazole, Thiadiazole, and Benzothiazepine Derivatives

Journal of Heterocyclic Chemistry, 2016
New series of substituted thiazole and thiadiazoles were prepared starting from N′‐(3,4‐dihydronaphthalen‐1(2H)‐ylidene)hydrazinecarbothiohydrazide by reacting with different types of hydrazonoyl chlorides. In addition, 7‐(4‐chlorophenyl)‐5,6,6a,7‐tetrahydrobenzo [b]naphtha‐[1,2‐e][1,4]thiazepine reacted with hydrazonoyl halides to afford a new ...
Fatma A. A. El‐Hag, Sobhi M. Gomha, Thoraya A. Farghaly   +2 more
openaire   +1 more source

A new efficient synthesis of pyrazoles from hydrazonoyl halides and β-oxophosphonates

Tetrahedron Letters, 2014
Abstract A new practical and efficient synthesis of 1,3,5-trisubstituted pyrazoles has been developed by reacting of hydrazonoyl halides with β-oxophosphonates under mild conditions in good yields with excellent regioselectivity. This process employs an addition–elimination sequence. Wide scope, functional group compatibility has been established.
Aixue Sun, Jia-Hai Ye, Haitao Yu, Wenchao Zhang, Xiaolong Wang   +4 more
openaire   +1 more source

ChemInform Abstract: REACTION OF HYDRAZONOYL HALIDES WITH N‐ARYL‐SUBSTITUTED BENZAMIDINES

Chemischer Informationsdienst, 1980
AbstractHydrazonoylchloride (I) reagieren mit den N‐Arylbenzamidinen (II) zu Mischungen aus den Reaktionsprodukten (III)‐(VII).
F. ANZANI, P. DALLA CROCE, R. STRADI
openaire   +1 more source

Hydrazonoyl Halides as Key Precursors for the Synthesis of Arylazo and Arylhydrazo Thiazoles

Mini-Reviews in Organic Chemistry
Abstract: Hydrazonoyl halides are versatile precursors in organic synthesis and are widely employed for constructing heterocyclic frameworks, including arylazo and hydrazo thiazoles. These compounds exhibit significant biological activities, including antimicrobial, antitumor, antiinflammatory, and antioxidant properties, as well as have applications ...
Sobhi M. Gomha, Magdi E. A. Zaki, Tariq Z. Abolibda, Thoraya A. Farghaly, Shubham Sharma, Yasser H. Zaki   +5 more
openaire   +1 more source

Tautomerism and Reactions of 1H-1,2,4-Triazole-5-thiones with Hydrazonoyl Halides

Journal f�r Praktische Chemie/Chemiker-Zeitung, 1998
The acid dissociation constants (Ka) of a series of 3,4-diaryl-1H-1,2,4-triazole-5-thiones (1) were determined and were found to correlated linearly with Hammett substituent constants; log Ka = 1.06 σx − 11.01. Such a result indicates that 1 exists essentially in one tautomeric form namely the thione form.
Mosselhi A. N. Mosselhi, Magda A. Abdallah, Sayed M. Riyadh, Abdelhamid E. Harhash, Ahmad S. Shawali   +4 more
openaire   +1 more source

Reactions with Hydrazonoyl Halides. Part 15.1 A Synthetic Approach to 2,3-Dihydrothiadiazoles

Journal of Chemical Research, 1998
Hydrazonoyl halides 1 and 6a–f reacted with methyl hydrazinecarbodithioate (2) and methyl 3-[1-(aryl)alkylmethylidene]hydrazinecarbodithioates (9a–d or 10a,b), in ethanolic triethylamine solution, to afford the corresponding 2-hydrazono-3,5-diphenyl-2,3-dihydro-1,3,4-thiadiazoles (3), 5-methyl-2-methylsulfanyl-6-phenylhydrazono-1,3,4-thiadiazine (8 ...
Hussein A. Emam, Hussein F. Zohdi, Adbou O. Abdelhamid   +2 more
openaire   +1 more source

Reaction of hydrazonoyl halides with N‐aryl substituted benzamidines

Journal of Heterocyclic Chemistry, 1980
AbstractThe reaction between hydrazonoyl halides and N‐arylbenzamidines leads to the simultaneous formation of products derived from a substitution and a cycloaddition reaction via two independent paths.
Fulvio Anzani, Piero Dalla Croce, Riccardo Stradi   +2 more
openaire   +1 more source

ChemInform Abstract: Reactions of C‐(Dialkoxyphosphoryl)hydrazonoyl Halides with Acid Salts.

ChemInform, 1991
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
B. I. BUZYKIN, M. P. SOKOLOV
openaire   +1 more source

Biological Activity, Apoptotic Induction and Cell Cycle Arrest of New Hydrazonoyl Halides Derivatives

Anti-Cancer Agents in Medicinal Chemistry, 2019
Background:The hydrazonoyl halides are presently an important target in the field of medicinal chemistry. The interest in the chemistry of hydrazonoyl halides is a consequence of the fact that they undergo a wide variety of reactions which provide routes to a myriad of both heterocyclic and acyclic compounds.
Magda F, Mohamed, Hamdi M, Hassaneen, Emad M, Elzayat, Salwa M, El-Hallouty, May, El-Manawaty, Fatma M, Saleh, Yasmin, Mohamed, Dina, El-Zohiry, Ghada, Fahmy, Nesma, Abdelaal, Nouran, Hassanin, Nouran, Hossam   +11 more
openaire   +2 more sources

[3 + 2] Cycloaddition Reaction of Vinylsulfonium Salts with Hydrazonoyl Halides: Synthesis of Pyrazoles

The Journal of Organic Chemistry
An efficient [3 + 2] cycloaddition reaction between in situ generated nitrile imines from hydrazonoyl halides and vinylsulfonium salts is developed. The nitrile imines are demonstrated to be a new class of reaction partner for vinylsulfonium salts to conduct the [3 + 2] cycloaddition reaction. The process provides a concise and efficient method for the
Wen-Jing Luo, Xiuwen Liang, Maizhuo Chen, Ke-Hu Wang, Danfeng Huang, Junjiao Wang, Dong-Ping Chen, Yulai Hu   +7 more
openaire   +2 more sources