Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Essmat M. El-Sheref"'
Publikováno v:
Heliyon, Vol 10, Iss 4, Pp e25248- (2024)
A novel series of 1,2-dihydroquinolinhydrazonopropanoate have been synthesized via a convenient aza-Michael addition reaction between hydrazinylquinolinones and ethyl propiolate in ethanol under refluxing temperature. The structures for all obtained
Externí odkaz:
https://doaj.org/article/cfcddc0ffea44e9c86bda78e5c847994
Autor:
Essmat M. El-Sheref, Hendawy N. Tawfeek, Alaa A. Hassan, S. Bräse, Mohammed A. I. Elbastawesy, Hesham A. M. Gomaa, Yaser A. Mostafa, Bahaa G. M. Youssif
Publikováno v:
Frontiers in Chemistry, Vol 10 (2022)
Novel series of amidines were synthesized via the interaction between alicyclic amines, cyclic ketones, and a highly electrophilic 4-azidoquinolin-2(1H)-ones without any catalyst or additive. All the obtained products were elucidated based on NMR spe
Externí odkaz:
https://doaj.org/article/7838b914297c44ca8a909e8ba6e7764a
Autor:
Lamya H. Al-Wahaibi, Essmat M. El-Sheref, Alaa A. Hassan, S. Bräse, M. Nieger, Bahaa G. M. Youssif, Mahmoud A. A. Ibrahim, Hendawy N. Tawfeek
Publikováno v:
Pharmaceuticals, Vol 16, Iss 7, p 1014 (2023)
2,3,4-trisubstituted thiazoles 3a–i, having a methyl group in position four, were synthesized by the reaction of 1,4-disubstituted thiosemicarbazides with chloroacetone in ethyl acetate/Et3N at room temperature or in ethanol under reflux. The struc
Externí odkaz:
https://doaj.org/article/17d2520974d8434bb027ac63093aa46c
Publikováno v:
Pharmaceuticals, Vol 16, Iss 3, p 467 (2023)
In this investigation, novel 4-((quinolin-4-yl)amino)-thia-azaspiro[4.4/5]alkan-3-ones were synthesized via interactions between 4-(2-cyclodenehydrazinyl)quinolin-2(1H)-one and thioglycolic acid catalyzed by thioglycolic acid. We prepared a new famil
Externí odkaz:
https://doaj.org/article/96bfdf1955cd4698b741d0332ad75f12
Autor:
Essmat M. El-Sheref, Mohamed A. Ameen, Kamal M. El-Shaieb, Fathy F. Abdel-Latif, Asmaa I. Abdel-naser, Alan B. Brown, Stefan Bräse, Hazem M. Fathy, Iqrar Ahmad, Harun Patel, Hesham A. M. Gomaa, Bahaa G. M. Youssif, Asmaa H. Mohamed
Publikováno v:
Molecules, Vol 27, Iss 24, p 8765 (2022)
Our investigation includes the synthesis of new naphthalene-bis-triazole-bis-quinolin-2(1H)-ones 4a–e and 7a–e via Cu-catalyzed [3 + 2] cycloadditions of 4-azidoquinolin-2(1H)-ones 3a–e with 1,5-/or 1,8-bis(prop-2-yn-1-yloxy)naphthalene (2) or
Externí odkaz:
https://doaj.org/article/4e4501f3216848af8481e48ec7fe5543
Autor:
Essmat M. El-Sheref, Mohammed A. I. Elbastawesy, Alan B. Brown, Ahmed M. Shawky, Hesham A. M. Gomaa, Stefan Bräse, Bahaa G. M. Youssif
Publikováno v:
Molecules, Vol 26, Iss 22, p 6798 (2021)
A mild and versatile method based on Cu-catalyzed [2+3] cycloaddition (Huisgen-Meldal-Sharpless reaction) was developed to tether 3,3’-((4-(prop-2-yn-1-yloxy)phenyl)methylene)bis(4-hydroxyquinolin-2(1H)-ones) with 4-azido-2-quinolones in good yield
Externí odkaz:
https://doaj.org/article/7610b55466f44c70935154c1ed148189
Autor:
Essmat M. El-Sheref, Ashraf A. Aly, Mohammed B. Alshammari, Alan B. Brown, Sara Mohamed Naguib Abdel-Hafez, Walaa Yehia Abdelzaher, Stefan Bräse, ElShimaa M. N. Abdelhafez
Publikováno v:
Molecules, Vol 25, Iss 21, p 5057 (2020)
A series of novel 1,2,3-triazoles hybridized with two quinolin-2-ones, was designed and synthesized through click reactions. The structures of the synthesized compounds were elucidated by NMR, IR, and mass spectra in addition to elemental analysis. T
Externí odkaz:
https://doaj.org/article/61db7afaa2ec412388ba8fb8bb73cb8f
Publikováno v:
ARKIVOC, Vol 2007, Iss 14, Pp 229-244 (2007)
Externí odkaz:
https://doaj.org/article/0afbbaebe3684863a6f8979e910cb2ba
Publikováno v:
ARKIVOC, Vol 2007, Iss 14, Pp 1-11 (2007)
Externí odkaz:
https://doaj.org/article/6bf2833db92346308c75f7a88352982b
Autor:
Ahmed M. Shawky, Ashraf A. Aly, Essmat M. El-Sheref, Alan B. Brown, Mohammed B. Alshammari, Mohammad Suleman Afroz Bakht, Adel Mohamed Abdelhakem
Publikováno v:
Zeitschrift für Naturforschung B. 76:395-403
Chalcones derivatized with 1-(2-quinolonyl)-1,2,3-triazoles were synthesized by reaction of 4-azido-2-quinolones with 1-phenyl-3-(4-propargyloxyphenyl)prop-2-en-1-one, or by aldol reaction of 4-{[1-(2-oxo-1,2-dihydroquinolin-4-yl)-1H-1,2,3-triazol-4-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afb7647840fa22d982237a7309927397
https://doi.org/10.1515/znb-2021-0028
https://doi.org/10.1515/znb-2021-0028