Design and synthesis of fluorescent 6-aryl[1,2-c]quinazolines serving as selective and sensitive ‘on-off’ chemosensor for Hg2+ in aqueous media
摘要:
Three fluorescent quinazolines thiophen-2-yl-5,6-dihydrobenzo-[4,5]imidazo[1,2-c]quinazoline (1), Pyridin-3-yl-5,6-dihydrobenzo-[4,5]imidazo-[1,2-c]quinazoline (2) and phenyl-5,5',6,6'-dihydrobenzo-[4,4',5,5']imidazo-[1.1',2-c,2'-c]quinazoline (3) have been synthesized. Structures of 1 and 3 have been authenticated crystallographically. Quinazolines 1-3 exhibit highly selective 'on-off' switching for Hg2+ ions. The fluorescence intensity displayed a linear relationship with respect to Hg2+ concentration (0.1-1.0 mu M; R-2 = 0.99) with detection limit of 2.0 x 10(-7) M. (C) 2012 Elsevier Ltd. All rights reserved.
A microwave-assisted copper-mediated tandem approach for fused quinazoline derivatives
作者:Satyaveni Malasala、Anusha Polomoni、Sai Manohar Chelli、Swayamsidda Kar、Y. V. Madhavi、Srinivas Nanduri
DOI:10.1039/d0ob02312d
日期:——
A method for the microwave-assisted copper-mediated oxidativecoupling reaction of different aldehydes and quinazolines/benzimidazoles has been developed for the synthesis of fused-polycyclic systems via new C–N bond formation. The current methodology involves the use of environmentally benign NH4OAc as the amine source in the presence of 2-propanol as the solvent. This novel tandem reaction approach