Structurally diversified synthesis of 2,3-dihydroquinazolin-4-(1H)-ones from 2-aminobenzamides and 1,2-dicarbonyl compounds in ionic liquids catalyzed by iodine
作者:Jie Wang、Mei-Mei Zhang、Xiang-Shan Wang
DOI:10.1007/s11164-016-2807-1
日期:2017.5
Abstract A green procedure for the rapid diversification of quinazolin-4-(1H)-one scaffolds is described in this paper. Various types of 1,2-dicarbonyl compounds are treated with 2-aminobenzamides in ionicliquidscatalyzed by iodine and unexpectedly afford structurally diversified single-quinazoline derivatives. The recyclability of the ionicliquids makes this protocol to be an environmentally benign
Sulfamic acid as energy efficient catalyst for synthesis of flurophores, 1-H-spiro [isoindoline-1,2′-quinazoline]-3,4′(3′H)-diones
作者:MANSING M MANE、DATTAPRASAD M PORE
DOI:10.1007/s12039-016-1047-7
日期:2016.4
An energy efficient synthesis of 1-H-spiro[isoindoline-1,2 ′-quinazoline]-3,4 ′(3 ′ H)-diones has been expediently accomplished by a reaction of isatin(s) / cyclic ketone and anthranilamide in ethanol at ambient temprature. Excellent yields of the products in short time duration, operational simplicity, and simple work-up procedure are the attractive features of the present protocol. Synthesized 1
A highly efficient and environmental benign procedure for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones via the condensation of carbonyl compounds with 2-aminobenzamide using a glycerol based ionic liquid with a boron core as a new and reusable promoting medium is described. A broad range of substrates including aldehydes and ketone were condensed with 2-aminobenzamide. All reactions are completed in short times and the products are obtained in good to excellent yields. The reaction medium could be recycled and reused several times without any loss of efficiency. Moreover, presented procedure has been applied successfully for the synthesis of some novel bis(pyrazolinone) derivatives. (C) 2013 Elsevier B.V. All rights reserved.
Efficient and convenient synthesis of spiroindolinone-quinazolines induced by stannous chloride
作者:Yu Hu、Man-Man Wang、Hui Chen、Da-Qing Shi
DOI:10.1016/j.tet.2011.09.130
日期:2011.12
An efficient, convenient, one-potsynthesis of 1′H-spiro[indoline-3,2′-quinazoline]-2,4′(3′H)-dione derivatives was accomplished in good yields via the novel reductive cyclization of 2-nitrobenzamides and isatins mediated by SnCl2·2H2O system. A variety of substrates can participate in the process with good yields, making this methodology have broad applicability. The structure of compound 3c has been