Results 41 to 50 of about 1,824 (162)

A facile microwave assisted one-pot synthesis of novel 1-methylhexahydroquinazolin-5(6H)-ones and bis-1-methylhexahydroquinazolin-5(6H)-ones

Orbital: The Electronic Journal of Chemistry, 2011
Novel hexahydroquinazolin-5(6H)-ones 3a-j have been synthesized in good yields by the reaction of enaminones 2a-b with primary amines and formaldehyde under the influence microwaves.
Madhusudhan Saha, Enamul Karim, Jai Narain Vishwakarma, Rishanlang Nongkhlaw   +3 more
doaj   +1 more source

Regioselectivity in the multicomponent reaction of 5-aminopyrazoles, cyclic 1,3-diketones and dimethylformamide dimethylacetal under controlled microwave heating

Beilstein Journal of Organic Chemistry, 2012
The multicomponent reaction of 5-aminopyrazole derivatives with cyclic 1,3-dicarbonyl compounds and dimethylformamide dimethylacetal (DMFDMA) in DMF at 150 °C under controlled microwave heating afforded regioselectively 8,9-dihydropyrazolo[1,5-a ...
Kamal Usef Sadek, Ramadan Ahmed Mekheimer, Tahany Mahmoud Mohamed, Moustafa Sherief Moustafa, Mohamed Hilmy Elnagdi   +4 more
doaj   +1 more source

Alum promoted synthesis of 2H-indazolo[2,1-b]phthalazinetrione derivatives in water

Orbital: The Electronic Journal of Chemistry, 2012
A new and efficient synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-trione derivatives from the three-component condensation reaction of phthalhydrazide, dimedone, and aromatic aldehydes using alum [KAl(SO4)2.12H2O] as catalyst was ...
Balaji Rajendra Madje, Jagdish V. Bharad, Milind B. Ubale, Murlidhar S. Shingare   +3 more
doaj   +1 more source

Synthesis of Cyano-Benzylidene Xanthene Synthons Using a Diprotic Brønsted Acid Catalyst, and Their Application as Efficient Inhibitors of Aluminum Corrosion in Alkaline Solutions

Molecules, 2022
Novel cyano-benzylidene xanthene derivatives were synthesized using one-pot and condensation reactions. A diprotic Brønsted acid (i.e., oxalic acid) was used as an effective catalyst for the promotion of the synthesis process of the new starting xanthene–
Mohammed A. Amin, Gaber A. M. Mersal, Morad M. El-Hendawy, Abdallah A. Shaltout, Ali Badawi, Johan Boman, Adil A. Gobouri, Murat Saracoglu, Fatma Kandemirli, Rabah Boukherroub, Jacek Ryl, Mohamed E. Khalifa   +11 more
doaj   +1 more source

Facile and Efficient Synthesis of Xanthene Derivatives Mediated by Lanthanum(III) Nitrate Hexahydrate under Solvent Free Conditions

Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2020
The present paper shows that lanthanum(III) nitrate hexahydrate can be used as mild and environment friendly homogeneous catalyst for an efficient one-pot multi-component synthesis of biologically active 1,8-dioxo-octahydroxanthene and 14H-dibenzo[a,j ...
Kabeer Ahmed Shaikh, Uddhav Nivrutti Chaudhar   +1 more
doaj   +1 more source

4a′-Hydroxy-3′,3′,5,6′,6′,7-hexamethyl-3′,4′,4a′,6′,7′,9a′-hexahydrospiro[indole-3,9′-xanthene]-1′,2,8′(1H,2′H,5′H)-trione

Molbank, 2023
Pseudo-multicomponent reactions (Pseudo-MCRs) have led to a variety of compounds with interesting biological properties, especially desirable in the pharmaceutical industry.
Yuliya E. Ryzhkova, Varvara M. Kalashnikova, Fedor V. Ryzhkov, Artem N. Fakhrutdinov, Michail N. Elinson   +4 more
doaj   +1 more source

Rh(III)-catalyzed chelation-assisted C–H activation/annulation of 2-arylimidazolines with cyclic diazo-1,3-dicarbonyl compounds: a novel approach to tetracyclic annulated derivatives of 2,3-dihydroimidazo[2,1-a]isoquinoline

Beilstein Journal of Organic Chemistry
2-Arylimidazolines were annulated with cyclic diazo-1,3-dicarbonyl compounds under Rh(III)-catalysis for the first time. The developed general and efficient approach based on CH-activation allowed the efficient preparation of five novel types of ...
Ivan Lyutin, Grigory Kantin, Olga Bakulina, Dmitry Dar'in   +3 more
doaj   +1 more source

Development of a Green Method for the Synthesis of Xanthene-1,8-dione Derivatives from Dimedone and Aldehydes

Engineering Proceedings
A green and efficient method was developed for the synthesis of 1,8-dioxo-octahydroxanthene derivatives using linear alkylbenzene sulfonic acid (LABSA) as an eco-friendly Brønsted acid catalyst under aqueous reflux conditions.
Imene Maallem, Malika Berredjem
doaj   +1 more source

Synthesis of Heterocyclic Compounds Derived From Dimedone and Their Anti-tumor and Tyrosine Kinase Inhibitions

Acta Chimica Slovenica, 2020
The reaction of dimedone with arylaldehydes gave the benzylidene derivatives 3a–c, the latter underwent a series of heterocyclization reactions to give fused thiophene, pyrazole isoxazole and pyridazine derivatives.
Rafat Mohareb, Fatma Manhi, Amal Abdelwahab   +2 more
doaj   +1 more source

NaHSO4–SiO2 Promoted Solvent-Free Synthesis of Triazolo [1,2-a]indazole-triones [PDF]

International Journal of New Chemistry, 2014
A new one-pot, efficient three-component condensation of dimedone, urazole and aromatic aldehydes in the presence of silica supported sodium hydrogen sulfate as an effective heterogeneous catalyst for the synthesis of novel Triazolo[1,2-a]indazole-1,3,8 ...
Hossein Anaraki-Ardakani
doaj   +1 more source