Synthesis and X-ray characterisation of a new polycondensed heterocycle obtained by a novel Mn(III)-mediated cascade reaction of 2-cyanophenyl isothiocyanate
loss of a CS moiety. The yields were close to 90% when the reaction was carried out in the presence of diethyl malonate. This compound was unambiguously identified by X-ray crystallography. Under the same conditions, 2-(methoxycarbonyl)phenyl isothiocyanate gave a quinazolinimine derivative instead which is likely to arise from cyclisation of an intermediate N,N′-diarylthiourea. The mechanism of formation
A convenient palladium-catalyzed carbonylative synthesis of 4(3H)-quinazolinones from 2-bromoformanilides and organo nitros with Mo(CO)<sub>6</sub> as a multiple promoter
A novel and convenient procedure for the synthesis of quinazolinones has been developed. Using 2-bromoformanilides and organo nitros as substrates and Mo(CO)6 as a multiple promoter, the desired products were isolated in moderate to excellent yields in the presence of a palladium catalyst. Here, Mo(CO)6 was not only a CO source, but also a nitro compound reducing reagent and a cyclization promoter
Convenient synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones: applications towards the synthesis of drugs
作者:Dinesh Kumar、Pradeep S. Jadhavar、Manesh Nautiyal、Himanshu Sharma、Prahlad K. Meena、Legesse Adane、Sahaj Pancholia、Asit K. Chakraborti
DOI:10.1039/c5ra03888j
日期:——
Simple, convenient, and green synthetic protocols have been developed for the one pot synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones under catalyst and solvent free conditions.
An efficient synthesis of quinazoline derivatives with the aid of low-valent titanium reagent
作者:Daqing Shi、Chunling Shi、Juxian Wang、Liangce Rong、Qiya Zhuang、Xiangshan Wang
DOI:10.1002/jhet.5570420201
日期:2005.3
Quinazolin-4(3H)-ones, 1,2-dihydroquinazolin-4(3H)-ones, 3,4-dihydroquinazolines, imidazo[1,2-c]-quinazolines and 5,6-dihydroimidazo[1,2-c]quinazolines were synthesized by the novel reductive reaction of nitro group, N-H bond and ortho-ester, aldehydes or ketones promoted by the low-valenttitaniumreagent (TiCl4-Zn system). The structures of these compounds were characterized by elemental analysis
喹唑啉-4(3 H)-one,1,2-二氢喹唑啉-4(3 H)-one,3,4-二氢喹唑啉,咪唑并[1,2- c ]-喹唑啉和5,6-二氢咪唑并[1,2 - c ^ ]喹唑啉通过将低价钛试剂(促进的TiCl硝基,NH键和原酸酯,醛或酮的新型还原反应,合成4 -Zn系统)。这些化合物的结构通过元素分析,IR和1 HNMR光谱进行表征,并通过单晶X射线衍射分析进一步证实。
Metal-free C–H methylation and acetylation of heteroarenes with PEG-400
作者:Vishal Suresh Kudale、Jeh-Jeng Wang
DOI:10.1039/d0gc01183e
日期:——
efficient route for methylation and acetylation of aza-heteroarenes using PEG-400 under O2 and TsOH·H2O for the first time by tuning the reaction conditions using a different set of starting materials. The key features of the current protocol are oxidative C–O and C–C bond scission under metal-free conditions with good functional group tolerance, and a broad substrate scope. The potential applicability