Convenient synthesis of 6,7-dihydroazolo[5,1-b]quinazolin-8(5H)-one derivatives
摘要:
Three-component condensation of 3(5)-aminoazoles with benzaldehydes and dimedone in acetonitrile in the presence of montmorillonite KSF as heterogeneous catalyst regioselectively afforded 5,6,7,9-tetrahydroazolo[5,1-b]quinazolin-8(4H)-one derivatives in good yields. Oxidation of the condensation products with ceric ammonium nitrate in acetone gave the corresponding 6,7-dihydroazolo[5,1-b]quinazolin-8(5H)-ones.
A simple, efficient and convenient approach has been reported for the synthesis of quinazolines by the condensation of 3-amino, 1,2,4-triazole with dimedone and different aromatic aldehydes in the presence of anthranilic acid as a catalyst through a one-pot reaction. The high yield, at low cost, with no need of chromatographic separation, and the environmentally friendly catalyst are the prominent
Nanoarchitectonics of magnetic covalent organic framework with sulfonic acid tags for catalytic preparation of triazolo quinazolinones and 4H-pyrimidobenzothiazoles
作者:Zahra Alishahi、Morteza Torabi、Mohammad Ali Zolfigol、Meysam Yarie
DOI:10.1016/j.jssc.2023.124119
日期:2023.8
fabrication of a new sulfonicacid modified covalent organic framework supported on Fe3O4 nanoparticles namely Fe3O4@COF–SO3H was introduced. Combining the important advantages of high specific surface area and porosity, chemical and thermal stability, magnetic responsibility and abundant sulfonicacid sites, make Fe3O4@COF–SO3H a robust and unique catalyst for the preparation of triazolo quinazolinones
介绍了一种用于制造负载在 Fe 3 O 4纳米粒子(即 Fe 3 O 4 @COF–SO 3 H )上的新型磺酸改性共价有机骨架的直接策略。结合高比表面积和孔隙率、化学和热稳定性、磁性响应和丰富的磺酸位点等重要优势,使 Fe 3 O 4 @COF–SO 3 H 成为制备三唑并喹唑啉酮和 4 H的强大而独特的催化剂嘧啶并苯并噻唑。此外,Fe 3 O 4 @COF–SO 3H具有方便的磁性,很容易从反应混合物中分离出来。这些因素反过来导致在温和和绿色条件下产生所需的分子。