Solvent-free multicomponent reactions using the novel N-sulfonic acid modified poly(styrene-maleic anhydride) as a solid acid catalyst
作者:Majid. M. Heravi、Elaheh Hashemi、Yahya Shirazi Beheshtiha、Khadijeh Kamjou、Maryam Toolabi、Nastaran Hosseintash
DOI:10.1016/j.molcata.2014.04.024
日期:2014.10
A novel one-pot three-component reaction: Synthesis of triheterocyclic 4H-pyrimido[2,1-b]benzazoles ring systems
作者:Ahmad Shaabani、Abbas Rahmati、Soheila Naderi
DOI:10.1016/j.bmcl.2005.08.101
日期:2005.12
A novel one-pot three-component condensation reaction of an aldehyde, beta-ketoester and 2-aminobenzimidazole or 2-aminobenzothiazole in 1,1,3,3-N,N,N',N'-tetramethylguanidinium trifluoroacetate as an ionic liquid is described. During the course of this reaction 4H-pyrimido[2,1-b]benzimidazoles or 4H-pyrimido[2,1-b]benzothiazoles are formed in high yields at 100 degrees C. The ionic liquid can be recovered conveniently and reused efficiently. (c) 2005 Elsevier Ltd. All rights reserved.
Convenient Approach for the One-Pot, Three-Component Synthesis of Triheterocyclic 4<i>H</i>-Pyrimido[2,1-<i>b</i>]benzothiazole Derivatives Using TBAHS
作者:Lingaiah Nagarapu、Hanmant K. Gaikwad、Jyothsna Devi Palem、Ramineni Venkatesh、Rajashaker Bantu、B. Sridhar
DOI:10.1080/00397911.2011.592624
日期:2013.1.1
An efficient and convenient synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives has been achieved by a one-pot, three-component condensation reaction of 2-amino-benzothiazole (1) with substituted benzaldehydes (2a-f) and beta-dicarbonyl derivatives (3a-e) in presence of 30 mol% of tetrabutylammonium hydrogen sulfate (TBAHS) in good to excellent yields.