title: Poly(4-vinylpyridine) supported acidic ionic liquid: a novel solid catalyst for the efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones under ultrasonic irradiation.
abstract: A novel poly(4-vinylpyridine) supported acidic ionic liquid catalyst was synthesized by the reaction of 4-vinylpyridine with 1,3-propanesultone, followed by the polymerization and the addition of the heteropolyacid. Due to the combination of polymer features and ionic liquid, it acted as a heterogeneous catalyst to effectively catalyze the cyclocondensation reaction of anthranilamide with aldehydes under ultrasonic irradiation and afforded the corresponding 2,3-dihydro-4(1H)-quinazolinones compounds in good to excellent yields. In addition, the catalyst could be easily recovered by the filtration and reused six times without significant loss of catalytic activity. More importantly, the use of ultrasonic irradiation can obviously accelerate the reaction.
authors.affiliation: Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China; School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China. Electronic address: wangjk@hxu.edu.cn.
authors.forename: Junke
authors.initials: J
authors.lastname: Wang
authors.forename: Yingxiao
authors.initials: Y
authors.lastname: Zong
authors.forename: Rugang
authors.initials: R
authors.lastname: Fu
authors.forename: Yuying
authors.initials: Y
authors.lastname: Niu
authors.forename: Guoren
authors.initials: G
authors.lastname: Yue
authors.forename: Zhengjun
authors.initials: Z
authors.lastname: Quan
authors.forename: Xicun
authors.initials: X
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Pan
keywords: 2,3-Dihydroquinazolin-4(1H)-ones; Ionic liquid; Poly(4-vinylpyridine); Ultrasonic irradiation