A Novel Method for the One-Pot Three-Component Synthesis of 2,3-Dihydroquinazolin-4(1<i>H</i>)-ones
作者:Peyman Salehi、Minoo Dabiri、Mohammad Ali Zolfigol、Mostafa Baghbanzadeh
DOI:10.1055/s-2005-865200
日期:——
One-pot three-component condensation of isatoic anhydride with primary amines or ammonium carbonate and aromatic aldehydes in refluxing ethanol in the presence of catalytic amounts of silica sulfuric acid afforded the corresponding 2,3-dihydroquinazolin-4(1H)-ones in high yields. The catalyst is reusable and can be applied several times without any decrease in product yield.
corresponding 2,3-dihydroquinazolin-4(1H)-one derivatives under ultrasonic irradiation or refluxconditions. This method gives notable advantages such as operational simplicity, excellent yields, short reaction times, and absence of any tedious workup or purification. In addition, the excellent catalytic performance and the easy preparation, thermal stability, and separation of the catalyst make it
摘要Fe 3 O 4 @SiO 2-亚胺基-PMA n有效催化异戊酸酐,醛,伯胺或铵盐的缩合反应,得到相应的2,3-二氢喹唑啉-4(1 H)-在超声波辐射或回流条件下的一种衍生物。该方法具有显着的优点,例如操作简便,产率高,反应时间短以及无需任何繁琐的后处理或纯化。另外,优异的催化性能以及催化剂的易于制备,热稳定性和分离使其成为良好的非均相体系,并且是其他非均相催化剂的有用替代品。同样,上述纳米催化剂可以容易地通过磁场回收,并且至少在六次后用于后续反应而不会明显降低催化活性和反应产率。 图形概要
Water-Accelerated Synthesis of Novel Bis-2,3-dihydroquinazolin-4(1<i>H</i>)-one Derivatives
Bisdihydroquinazolinones were synthesized for the first time by a novel pseudo five-component condensation of isatoic anhydride, a primary amine, and a dialdehyde in water. Several solvents were examined for this reaction; however, in terms of reaction yield and time, water was found to be the optimum solvent.
Synthesis of Quinazolinones from Alcohols<i>via</i>Laccase-Mediated Tandem Oxidation
作者:Marjan Heidary、Mehdi Khoobi、Sabrieh Ghasemi、Zohreh Habibi、Mohammad Ali Faramarzi
DOI:10.1002/adsc.201400103
日期:2014.5.26
This paper describes the synthesis of quinazolinones via a tandem reaction using the laccase‐mediator system under mild conditions. The procedure involved the laccase‐catalyzed oxidation of alcohols to the corresponding aldehydes, followed by cyclocondensation with isatoic anhydride and a number of amines to afford 2,3‐dihydroquinazolin‐4(1H)‐ones, which were further oxidized to quinazolinones in useful
2,3-Dihydroquinazolin-4(1H)-ones were efficiently synthesised by the reaction of isatoic anhydride, a primary amine or ammonium acetate, and different aromatic aldehydes in 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) without using any acidic catalyst. Also a bis-derivative of the title compound as a polyheterocyclic system was synthesised successfully in high yield.