نتایج جستجو برای: 2-Substituted cyclohexane-1,3-diones

تعداد نتایج: 2741042  

2013
Mostafa Kiamehr Firouz Matloubi Moghaddam Satenik Mkrtchyan Volodymyr Semeniuchenko Linda Supe Alexander Villinger Peter Langer Viktor O Iaroshenko

The cyclization of cyclohexane-1,3-diones with various substituted pyridinium salts afforded functionalized 8-oxa-10-aza-tricyclo[7.3.1.0(2,7)]trideca-2(7),11-dienes. The reaction proceeds by regioselective attack of the central carbon atom of the 1,3-dicarbonyl unit to 4-position of the pyridinium salt and subsequent cyclization by base-assisted proton migration and nucleophilic addition of th...

2013
Wafaa S. Hamama Mohamed A. Ismail Hanaa A. Al-Saman Hanafi H. Zoorob

The reaction of 6-amino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione (1) as a binucleophile with primary aromatic or heterocyclic amines and formaldehyde or aromatic (heterocyclic) aldehydes in a molar ratio (1:1:2) gave the pyrimido[4,5-d]pyrimidin-2,4-dione ring systems 2-5. Treatment of 1 with diamines and formalin in molar ratio (2:1:4) gave the bis-pyrimido[4,5-d]pyrimidin-2,4-diones 6-8. Furth...

Journal: :Molecules 2005
Bin Li Dong Xiang Chi-Tung Hsu Zhen-Long Liu Chao Wu Hua-Zheng Yang

Novel 1-phenyl-piperazine-2,6-diones were prepared by a new facile synthetic route using methyl N-substituted iminomonoacetate as starting material. The structures of these compounds were established by (1)H-NMR, (13)C-NMR and GC/MS. 2-(4-Chloro-5-cyclo-pentyl-oxy-2-fluorophenyl)-tetrahydro-2H-pyrido-[1,2-a]-pyrazine-1,3-(4H,6H)-dione displayed the greatest herbicidal activity.

2013
Lidia S Konstantinova Kirill A Lysov Ljudmila I Souvorova Oleg A Rakitin

Treatment of N-substituted 2-(methylamino)naphthoquinones 3 and -anthracene-1,4-diones 4 with S2Cl2 and DABCO in chlorobenzene gave the corresponding 2,3-dihydronaphtho[2,3-d][1,3]thiazole-4,9-diones 1 and 2,3-dihydroanthra[2,3-d][1,3]thiazole-4,11-diones 2 by triethylamine addition, in high to moderate yields. The DABCO replacement for N-ethyldiisopropylamine in the reaction of anthracene-1,4-...

Journal: :New Journal of Chemistry 2023

Correction for ‘Triflic acid-catalyzed metal-free synthesis of ( E )-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones’ by Bapurao D. Rupanawar et al. , New J. Chem. 2018, 42 6433–6440, https://doi.org/10.1039/C7NJ05169G.

2011
Javed Sheikh Harjeet Juneja Parvez Ali Vishwas Ingle

A series of highly functionalized 1-(2',4'-dihydroxy-5'-substituted phenyl)-3-thienylpropane-1,3-diones 3a-g have been produced upon Baker-Venkataraman rearrangement of 4hydroxy-5-substituted-2-thienoyloxyacetophenones 2a-g using dimethylsulphoxide in NaOH. All the synthesized motifs 3a-g were confirmed by the spectroscopic analyses and evaluated for antibacterial efficacy against different pat...

Journal: :Beilstein Journal of Organic Chemistry 2005
Oldřich Paleta Karel Pomeisl Stanislav Kafka Antonín Klásek Vladislav Kubelka

Substituted 3-(fluoroacyloxy)quinoline-2,4(1H,3H)-diones including 3-(fluoroiodoacetoxy) derivatives react with triethyl phosphite to afford either the product of the Perkow reaction or the corresponding 4-ethoxyquinolin-2(1H)-one. In both reactions, the fluorocarboxylate anion acts as the first observed leaving group. This observation restricts the application of the intramolecular Horner-Wads...

Journal: :Molecules 2004
Plamen A Angelov Iliyan I Ivanov Atanas P Venkov

A series of novel 11b-substituted 1,6,7,11b-tetrahydropyrimido[6,1-a]- isoquinoline-2,4-diones and 4-thioxo-1,3,4,6,7,11b-hexahydropyrimido[6,1-a]isoquinolin-2- ones were synthesized, utilizing two alternative strategies for ring closure of tetrahydroisoquinoline intermediates obtained from N-phenethyl enaminones.

Journal: :Acta pharmaceutica 2016
Hend N Hafez Abdel-Rhman B A El-Gazzar Magdi E A Zaki

6'-(4-Chlorophenyl)-spiro[cyclohexane-1,2'-thieno[3,2-d][1,3] oxazin]-4'(1'H)-one (1) was synthesized and used as a starting material for the synthesis of a novel series of spiro compounds having biologically active sulfonamide 2a-e and 3'-(4-acetylphenyl)-6'- (4-chlorophenyl)-1'H-spiro[cyclohexane-1,2'-thieno[3,2-d] pyrimidine-4'(3'H)-one (3). Compound 2a was used as a key intermediate for the...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید