Efficient synthesis of 2,3-disubstituted-2,3-dihydroquinazolin-4(1H)-ones catalyzed by dodecylbenzenesulfonic acid in aqueous media under ultrasound irradiation
作者:Bao-Hua Chen、Ji-Tai Li、Guo-Feng Chen
DOI:10.1016/j.ultsonch.2014.08.024
日期:2015.3
Synthesis of 2,3-disubstituted-2,3-dihydroquinazolin-4(1H)-one derivatives catalyzed by dodecylbenzenesulfonic acid was carried out in 80-92% yields at 40-42 °C within 1-2 h in aqueous media via one-pot three-component condensation of isatoic anhydride, aromatic aldehyde and amine under ultrasound irradiation. Convenient work-up procedures, mild reaction conditions, avoiding the use of organic solvents
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.
Efficient synthesis of mono- and disubstituted 2,3-dihydroquinazolin-4(1H)-ones using aluminum methanesulfonate as a reusable catalyst
作者:Zhiguo Song、Lianli Liu、Yang Wang、Xiaohu Sun
DOI:10.1007/s11164-011-0445-1
日期:2012.3
A wide range of mono- and disubstituted 2,3-dihydroquinazolin-4(1 H )-ones were synthesized via a one-pot three components condensation of isatoic anhydride, aldehydes, and ammonium salts or primary amines in the presence of aluminum methanesulfonate in EtOH/H2O solution. The catalyst is reusable and could be recycled for several runs without any distinct decrease in its efficiency. A plausible mechanism
在甲磺酸铝的存在下,通过一锅三组分的ISA酸酐,醛,铵盐或伯胺的缩合反应合成了广泛的单和二取代的2,3-二氢喹唑啉-4(1 H )-。 EtOH / H 2 O溶液。该催化剂是可重复使用的,并且可以循环使用几次,而不会明显降低其效率。提出了这种一锅三组分反应的合理机制。
One-pot synthesis of 2,3-dihydroquinazolin-4(1H)-ones by Fe3O4@SiO2-imid-PMAn nano-catalyst under ultrasonic irradiation and reflux conditions
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.