Results 31 to 40 of about 126,036 (251)

Reactions with hydrazonoyl halides XXVIII*: Synthesis of some 2-thiazolylimino-2,3-dihydro-1,3,4-thiadiazoles [PDF]

Heteroatom Chemistry, 2000
Abdou O. Abdelhamid, Nadia A. Abdel‐Riheem, Nabil M. Hassan   +2 more
  +5 more sources

Reactions with hydrazonoyl halides: Part XVIII-Synthesis of pyrrolidino[3,4-c] pyrazole, pyrazolo[3,4-d]pyridazine, imidazo-[1,2-a ]pyridine, pyrazolo[3,4-d]pyrimidine and other heterocyclic derivatives [PDF]

, 1997
880 ...
Abdelhamid, Abdou O, Emam, Hussein A
core   +1 more source

Reaction with hydrazonoyl halides XXIII [1]: Synthesis and reactions of C-coumarinoyl-N-arylformohydrazonoyl bromides [PDF]

Heteroatom Chemistry, 1999
Abdou O. Abdelhamid, Gaber S. Mohamed
openalex   +3 more sources

Site selectivity in reaction of hydrazonoyl halides with 2-(aroylmethyl)-6-methylpyrimidin-4(3H)-ones

Journal of Chemical Research, 2008
Reaction of hydrazonoyl halides 1 with 2-(aroylmethyl)-6-methylpyrimidin-4(3H)-ones 3 proved to be site selective and gave 2-(3-acetyl-1,5-diarylpyrazol-4-yl)-6-methylpyrimidin-4(3H)-ones 5 via dehydrative cyclisation of the hydrazone intermediates 4. The structures of both 4 and 5 were elucidated by spectral data and alternative synthesis.
Ahmad S. Shawali, Thoraya A. Farghaly
openalex   +4 more sources

Photoinduced 1,3‐Dipolar Cycloadditions of Cyclic Enones and 2,5‐Disubstituted Tetrazoles: An Unprecedented Pathway to Polysubstituted Pyrazolines and Pyrazoles

European Journal of Organic Chemistry, Volume 26, Issue 47, December 13, 2023., 2023
1,3‐dipolar cycloaddition of cyclic enones with 2,5‐disubstituted nitrile‐imines obtained by photochemical activation of 2,5‐diaryl substituted tetrazoles leads to the formation of novel pyrazoles and pyrazolines. Reactions can be monitored using UV‐vis absorption and emission measurements.
Chiraz Labassi, Nicolas Fournier‐Le Ray, Fabienne Gauffre, Jean‐Luc Fillaut, Rafik Gatri   +4 more
wiley   +1 more source

Synthetic Routes to Imidates and Their Applications in Organic Transformation: Recent Progress

European Journal of Organic Chemistry, Volume 26, Issue 39, October 16, 2023., 2023
Imidates are important organic intermediates used in several synthetic transformations towards N‐heterocycles, natural products and metal complexes with a potential catalytic effect. Herein, the recent synthetic approaches and diverse applications of imidates were categorized and summarized.
Andriani G. Chaidali, Ioannis N. Lykakis
wiley   +1 more source

Synthesis of new functionalized derivatives of indolo[2,3-e][1,2,4]-triazolo-[4,5-b]-1,2,4-triazine [PDF]

Journal of the Serbian Chemical Society, 2013
New functionalized 1,2,4-triazolo-[4,3-b]-1,2,4-triazino-[5,6-b]indole derivatives were synthesized via reaction of the hydrazonoyl halides with 5H-2,3-dihydro-1,2,4-triazino[5,6-b]indole-3-thione or its 3-methylthio derivative.
Gomha Sobhi M., Abdel-Aziz Hatem A.
doaj   +1 more source

Different Synthetic Methods for the Preparation of Triazolopyrimidines and their Biological Profile

ChemistrySelect, Volume 8, Issue 23, June 20, 2023., 2023
This review aims to give a broad overview of the synthetic methods, starting from aminotriazoles and pyrimidines, leading to heterocyclic systems containing the triazolopyrimidine ring and presenting the reactivity of these derivatives. Additionally, we have summarized the most important biological activities.
Achraf Hibot, Asmaa Oumessaoud, Abderrafia Hafid, Mostafa Khouili, Maria Dolors Pujol   +4 more
wiley   +1 more source

Synthesis, Characterization and Molecular Docking of Novel Bioactive Thiazolyl-Thiazole Derivatives as Promising Cytotoxic Antitumor Drug

Molecules, 2015
Reactions of ethylidenethiocarbohydrazide with hydrazonoyl halides gave 1,3-thiazole or 1,3,4-thiadiazole derivatives according to the type of hydrazonoyl halides.
Sobhi M. Gomha, Taher A. Salaheldin, Huwaida M. E. Hassaneen, Hassan M. Abdel-Aziz, Mohammed A. Khedr   +4 more
doaj   +1 more source

Recent developments in chemical reactivity of N,N-dimethylenamino ketones as synthons for various heterocycles [PDF]

, 2017
The current review presents recent progress in the utility of N,N-dimethyl enaminones as building blocks for a diverse range of acyclic, carbocyclic, five- and six-membered heterocyclic a broad range of heterocyclic and fused heterocyclic derivatives ...
Abbas, Abdallah, Abdallah, Abdallah, Abdel-Khalik, Abdel-Khalik, Abdel-Khalik, Abdel-Megid, Abdel-Motaleb, Abdel-Motaleb, Abdelhamid, Abdelhamid, AbdelKhalik, Abu-Shanab, Abu-Shanab, Adams, Agamy, Agamy, Al-Awadi, Al-Awadi, Al-Awadi, Al-Enezi, Al-Etaibi, Al-Mousawi, Al-Mousawi, Al-Mousawi, Al-Mousawi, Al-Mousawi, Al-Mousawi, Al-Mousawi, Al-Omran, Al-Omran, Al-Omran, Al-Omran, Al-Omran, Al-Omran, Al-Omran, Al-Omran, Al-Saleh, Al-Saleh, Al-Saleh, Al-Saleh, Al-Saleh, Al-Saleh, Al-Saleh, Al-Saleh, Al-Shiekh, Al-Shiekh, Al-Shiekh, Al-Zaydi, Al-Zaydi, Al-Zaydi, Al-Zaydi, Al-Zaydi, Al-Zaydi, Al-Zaydi, Alinezhad, Alinezhad, Almazroa, Anwer, Behbehani, Cao, Dawood, Domínguez, El-Desoky, El-Dusouqui, El-Taweel, Eldebss, Elghamry, Farghaly, Figueiredo, Gaber, Gaber, Gaber, Gaber, Gaber, Gaber, Gad-Elkareem, Gad-Elkareem, Ghozlan, Ghozlan, Ghozlan, Gomha, Gomha, Gomha, Gomha, Gomha, Greenhill, Hassanien, Hassanien, Hassanien, Hernández, Ho, Ho, Ho, Hughes, Ibrahim, Igarashi, Ingham, Jiang, Kandeel, Kantevari, Kascheres, Katritzky, Katritzky, Kenawi, Kepe, Kepe, Kim, Kirschbaum, Liu, Lue, Macba, Macba, Makhseed, Manley, Martins, Michael, Mokhtar, Mousawi, Moustafa, Mukhanova, Murphy, Negri, Nishimura, Nishiyama, Pichon, Pigge, Pleier, Raghunadh, Rasmussen, Reidlinger, Sabnis, Saleh, Salomone, Schenone, Shaaban, Shankaraiah, Sherif, Toche, Tois, Trautwein, Verma, Wan, Wan, Wan, Wan, Wan, Wang, Witherington, Xiang, Zhao, Zhou, Šimůnek   +153 more
core   +1 more source