acidic catalyst for the synthesis of isoindolo[2,1-a]quinazoline-5,11-dione derivatives under green conditions. Thus the Wang-OSO3H catalyzed MCR of isatoic anhydride, 2-formylbenzoic acid and various amines in pure water afforded a range of desired product in good to excellent (86-94%) yield. The methodology can be performed under open air and is amenable for scale-up synthesis. The catalyst can be recovered
The synthesis of 2,3-dihydroquinazoline-4(1H)-one and dihydroisoindolo[2,1-a]quinazoline-5,11-dione derivatives in the presence of imidazolium ionic liquid sulfonic acid functionalized SBA-15: a novel feature of SBA-15
3-dihydroquinazoline-4(1H)-one and dihydroisoindolo[2,1-a]quinazoline-5,11-dione derivatives via three-component reaction between isatoic anhydride, amines and aromatic aldehydes at 50 °C in ethanol and water mixture as solvent. We found the synthetic imidazolium ionic liquid sulfonicacid functionalized SBA-15 as a convenient catalyst for this methodology. The catalyst performs the reaction in mild reaction conditions
Various isoindolo[2,1‐a]quinazoline‐5,11‐dione derivatives 3 were synthesized in good yields by means of the reductive reaction of N‐substituted 2‐nitrobenzamides 1 and 2‐formylbenzoic acids 2 in the presence of SnCl2⋅2 H2O under reflux in EtOH (Scheme, Table). The procedure needed two steps, the reduction of the nitro group of the 2‐nitrobenzamide and ring closure by nucleophilic addition of the NH2
各种异吲哚基[2,1-一个]喹唑啉-5,11-二酮衍生物3进行以良好的收率由的还原反应的方法合成ñ -取代的2- nitrobenzamides 1和2甲酰基酸2中的SnCl存在2 ⋅在EtOH中回流下的2 H 2 O(方案,表)。该过程需要两个步骤,即2-硝基苯甲酰胺的硝基还原和通过在甲酰基和羧酸CO基团上亲核加成NH 2基来闭环。