65331-20-6Relevant academic research and scientific papers
One pot synthesis of spiro pyrimidinethiones/spiro pyrimidinones, quinazolinethiones/quinazolinones, and pyrimidopyrimidines
Gupta, Poonam,Gupta, Shallu,Sachar, Anand,Kour, Daljeet,Singh, Jasbir,Sharma, Rattan L.
experimental part, p. 324 - 333 (2010/06/13)
(Chemical Equation Presented) Condensation of cyclohexane-1,3-dione/ barbituric acid, thiourea/urea, and aromatic aldehyde in the mole ratio of 1:1:3 in solventless reaction in presence of NiCl2/KI afforded 1,5-diaryl-3-thioxo-2,4-diazaspiro[5.5]undecane-7,11-dione/1,5-diaryl-2, 4-diazaspiro[5.5]undecane-3,7,11-trione analogues and 7,11-diaryl-9-thioxo-2,4, 8,10-tetraazaspiro[5.5]undecane-1,3,5,-trione/7,11-diaryl-2,4,8, 10-tetraazaspiro[5.5] undecane-1,3,5,9-tetraone analogues, respectively. The similar condensation of cyclohexane-1,3-dione/cyclohexanone, thiourea/urea, and aromatic aldehyde/heteroaromatic aldehyde in the mole ratio of 1:1:1 in refluxing methanol afforded 4-aryl/heteroaryl-2-thioxo-1,2,3,4,5,6,7,8- octahydroquinazolin-5-one, 4-aryl/heteroaryl-1,2,3,4,5,6,7,8- octahydroquinazoline-2,5-dione analogues and 4-aryl/heteroaryl-1,2,3,4,5, 6,7,8-octahydroquinazoline-2-thione, 4-aryl/heteroaryl-1,2,3,4,5,6,7,8- octahydroquinazolin-2-one analogues, respectively. Condensation of heterocyclic active methylene compound, barbituric acid, thiourea/urea, and aromatic aldehydes under similar set of conditions in 1:1:1 mole ratio was carried which afforded 5-aryl-7-thioxo-1,2,3,4,5,6,7,8-octahydropyrimido[4,5-d]pyrimidine-2,4- dione/5-aryl-1,2,3,4,5, 6,7,8-octahydropyrimido[4,5-d]pyrimidine-2,4,7-trione analogues. Similar condensation of an active methine compound, 2-acetylcyclohexanone, thiourea/urea, and aromatic aldehydes in the mole ratio of 1:1:1 produced 5-aryl-1-methyl-3-thioxo-2,4-diazaspiro[5.5]undec-1-en-7-one/ 5-aryl-1-methyl-2, 4-diazaspiro[5.5]undec-1-ene-3, 7-dione analogues, the spiro compounds of entirely different kind. All these identifications and characterizations have been based on the elemental analysis and spectral data.
Synthesis of 3,4-dihydropyrimidin-2(1H)ones and 3,4,5,6,7,8- hexahydroquinazolin-2(1H)-ones via three component cyclocondensation
Phucho,Nongpiur,Nongrum,Nongkhlaw
experimental part, p. 346 - 350 (2010/10/03)
3,4 Dihydropyrimidin-2(1H)-ones and 3,4,5,6,7,8-hexahydroquinazolin-2(1H)- ones have been synthesized from the condensation of ketones, aldehydes and urea/thiourea in the presence of sodium tertiary butoxide by the solventless microwave irradiation (MWI)
3,4-Disubstituted-1,2,3,4,5,6,7,8-octahydroquinazoline-2-thiones: Synthesis, antimicrobial evaluation and QSAR investigations using Hansch analysis
Minu, Maninder,Thangadurai, Ananda,Wakode, Sharad R.,Agrawal, Shyam S.,Narasimhan, Balasubramanian
experimental part, p. 231 - 239 (2009/04/03)
The 3,4-disubstituted-1,2,3,4,5,6,7,8-octahydroquinazoline-2-thione derivatives were synthesized and characterized by physicochemical and spectral means, and the results of antimicrobial study of these compounds against Staphylococcus aureus, Escherichia
Development of new molecular entities as potent non-steroidal non-acidic anti-inflammatory agents - Part-I: Synthesis of some substituted pyrazolo-[3,4-a] thiozolo [2′,3'-b] quinazolines
Akula, Kalyan Chakravarthy,Tatikonda, Suresh,Reddy Vanga, Malla
, p. 389 - 394 (2007/10/03)
Eight 6-aryl-2,3,4,5-tetrahydro-7,8,9,10-tetrahydro-11H-pyrazolo [3,4-a] thiazolo [2,3-b] quinazolines were prepared 5a-h from the respective 5H-5-aryl-6,7,8,9-tetrahydro thiazolo[2,3-b]quinazolin-3(2H)-ones by a cycloaddition reaction of hydrazine/phenyl
Highly chemoselective multicomponent biginelli-type condensations of cycloalkanones, urea or thiourea and aldehydes
Zhu, Yu-Lin,Huang, Shen-Lin,Pan, Yuan-Jiang
, p. 2354 - 2367 (2007/10/03)
The classical Biginelli reaction is considerably extended by use of cycloalkanones instead of 1,3-dicarbonyl compounds. Use of TMSCl as a Lewis acid allowed one-pot chemoselective multicomponent Biginelli reactions between cycloalkanones, urea or thiourea, and aldehydes. Under similar reaction conditions, thiourea exhibited different behavior to urea, and aliphatic aldehydes showed lower reactivity than aromatic aldehydes. A possible mechanism to account for the reaction is proposed. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
