Results 111 to 120 of about 8,057 (210)

Synthesis of bridged bicyclic thiazine-2-thione and thiazole-2-thiones through DBU-promoted regioselective annulation of quinone monoacetals under mild conditions

Green Synthesis and Catalysis
The first regioselective [4 ​+ ​2] annulation reactions of quinone monoacetals with isothiocyanates and Na2S have been accomplished. This convenient and novel protocol involves the synthesis of valuable bridged thiazine-2-thione and thiazole-2-thiones ...
Hong Qin, Man Yang, Yuguang Li, Xiaobing Yang, Yujing Hu, Chengkou Liu, Wei He, Zheng Fang, Kai Guo   +8 more
doaj   +1 more source

Mesoporous molecular sieve MCM-41 catalyzed one-pot synthesis of 3,4-dihydro-2(1H)-pyrimidinones and –thiones under solvent-free conditions

Bulletin of the Chemical Society of Ethiopia, 2011
An efficient synthesis of 3,4-dihydro-2(1H)-pyrimidinones and -thiones using MCM-41 as the catalyst from an aldehyde, β-keto ester, and urea or thiourea under solvent-free conditions is described.
Rahim Hekmatshoar, Maryam Heidari, Majid. M. Heravi, Bita Baghernejad   +3 more
doaj  

Ureas derivadas de 2-amino-1,3-propanodiol y 1,3-diamino-2-propanol con potencial actividad antibacteriana. Síntesis y caracterización estructural [PDF]

, 2017
Acinetobacter baumannii es un cocobacilo Gram negativo, no fermentador, aerobio estricto, catalasa positivo y oxidasa negativo. Es origen de infecciones nosocomiales en piel, torrente sanguíneo, tracto urinario y tracto respiratorio, sobre todo en la UCI.
Lorente Guarnido, Raquel
core  

Tautomeric Cyclic Thiones. Part IV. The Thione-thiol Equilibrium in some Azoline-2-thiones. [PDF]

Acta Chemica Scandinavica, 1969
Gunnar Kjellin, Jan Sandström, T. Willadsen, D. Heinegård, Alexandru T. Balaban, J. Cymerman Craig   +5 more
openaire   +1 more source

SYNTHESIS OF 3-ARYLMETHYL-4- THIAZOLIDINE-CARBOXYLIC ACID-2-ONES AND 2-THIONES [PDF]

Journal of Sciences, Islamic Republic of Iran, 1998
Barium salts of dibenzylidene cystines 8a-c were obtained from the reaction of Lcystine with benzaldehyde or its derivatives in the presence of barium hydroxide.
doaj  

Synthesis and In Vitro Investigation of Insecticidal Activity of Some Tricyclic Quinazolines and Their Thioanalogues

Journal of Basic and Applied Research in Biomedicine, 2022
Hydrochlorides of 2,3-trimethylene-3,4-dihydroquinazoline (deoxypeganine, 3) and 2,3-trimethylene-3,4-dihydroquinazolin-4-one (deoxyvasicinone, 4), 2,3-trimethylene-3,4-dihydroquinazolin-4-thione (deoxyvasicinthione, 5), 2,3-tetramethylene-3,4 ...
A Nasrullayev, N Tosheva, B Elmuradov, A Eshmuratova, Sh Azimova   +4 more
doaj  

Recent advances in the synthesis of triazole derivatives [PDF]

, 2015
Triazole ring system has attracted a continuously growing interest of synthetic organic chemists and those dealing with the medicinal compounds due to its versatile potential to interact with biological systems.
Ahmad, Matloob, Aslam, Sana, Jawwad, Muhammad, Khan, Imran Ahmad, Mansha, Asim, Raza Naqvi, Syed Ali, Zahoor, Fawad   +6 more
core  

Efficient sodium selenate-catalyzed synthesis of 3,4-dihydro-2(1H)-pyrimidinones and –thiones under solvent-free conditions

Bulletin of the Chemical Society of Ethiopia, 2009
Sodium selenate efficiently catalyzes the three-component Biginelli reaction of an aldehyde, a,β-keto ester and urea or thiourea under solvent-free conditions to afford the corresponding 3,4-dihydropyrimidin-2(1H)-ones or –thiones in excellent yields.
Rahim Hekmatshoar, Maryam Heidari, Majid M. Heravi, Bita Baghernejad   +3 more
doaj  

Some transformations in a series of 4-amino-1,2,4-triazole-3-thion derivatives

Aktualʹnì Pitannâ Farmacevtičnoï ì Medičnoï Nauki ta Praktiki
The continuous improvement of synthesis methods enables the optimization of the process for developing and obtaining target products of chemical transformation. Derivatives of 1,2,4-triazole-3-thiol present a convenient object for chemical transformation,
O. A. Bihdan, V. V. Parchenko, B. V. Gutyj   +2 more
doaj   +1 more source

One-pot three-component synthesis of 4-aryl-3,4-dihydro-pyrimidin-2(1H)-thiones catalyzed by Ni loaded SiO₂

Bulletin of the Chemical Society of Ethiopia, 2012
A simple and efficient method has been developed for the synthesis of 4-aryl-3,4-dihydropyrimidin-2(1H)-thiones from methyl 3-oxopentanoate, aldehydes and thiourea in the presence of a catalytic amount of Ni loaded SiO2 at room temperature.DOI: http://dx.
Sreekanth B. Jonnalagadda, Suresh Maddila   +1 more
doaj