2,3-Dihydroquinazolin-4(1H)-one derivatives have been synthesized via one-pot reaction of isatoic anhydride, aromatic aldehyde, and ammonium acetate catalyzed by FeCl3/neutral Al2O3 in tert-butanol under reflux conditions. Inexpensive and easily available reagents, convenient work-up procedure, reusable catalyst, and moderate to good yield are the salient features of this protocol.
Aerobic oxidative synthesis of quinazolinones and benzothiazoles in the presence of laccase/DDQ as a bioinspired cooperative catalytic system under mild conditions
study applied laccase/DDQ as a bioinspired cooperative catalyticsystem for the synthesis of quinazolinones (80–95% yield) and benzothiazoles (65–98% yield) using air or O2 as ideal oxidants in aqueous media at ambient temperature. The aerobicoxidative cyclization reactions occur in two steps: (i) chemical cyclization; (ii) chemoenzymatic oxidation. These methods are more environment-friendly, efficient
目前的研究将漆酶/DDQ 作为一种受生物启发的协同催化系统,在环境温度下使用空气或 O 2作为水介质中的理想氧化剂合成喹唑啉酮(80-95% 产率)和苯并噻唑(65-98% 产率)。好氧氧化环化反应分两个步骤进行: (i) 化学环化;(ii) 化学酶氧化。由于使用O 2作为氧化剂,漆酶作为生态友好的生物催化剂,水性介质作为溶剂,并且不含任何有毒的过渡金属和卤化物,这些方法比其他报道的方法更环保、高效、简单和实用。催化剂。因此,这些方法可以应用于制药和其他敏感的合成过程。
Sulfonic acid functionalized Wang resin (Wang-OSO3H) as polymeric acidic catalyst for the eco-friendly synthesis of 2,3-dihydroquinazolin-4(1H)-ones
作者:A.V. Dhanunjaya Rao、B.P. Vykunteswararao、T. Bhaskarkumar、Nivrutti R. Jogdand、Dipak Kalita、Jaydeep Kumar D. Lilakar、Vidavalur Siddaiah、Paul Douglas Sanasi、Akula Raghunadh
DOI:10.1016/j.tetlet.2015.06.004
日期:2015.8
An efficient and green approach has been developed for the synthesis of 2-substituted 2,3-dihydroquinazolin-4(1H)-ones directly from corresponding substituted aromatic and aliphatic aldehyde and anthranilamide using recyclable polymer supported sulfonic acid catalyst under aqueous conditions. Environmental acceptability, operational simplicity, low cost, excellent functional group compatibility, and
PEG-SO3H as Eco-friendly Polymeric Catalyst for the Synthesis of 2,3-Dihydroquinazolinones in Water
作者:Guoli Huang、Bo Liu、Mingyu Teng、Yegao Chen
DOI:10.2174/1570178613666160728101809
日期:2016.9.21
A facile, efficient, green, and environmentally benign method is described for the synthesis
of 2,3-dihydroquinazolin-4(1H)-ones by direct cyclocondensation of 2-aminobenzamide with aldehydes
or ketones in water using PEG-SO3H as an acidic catalyst under room temperature. This new method
totally avoids the use of organic acids, toxic or expensive solvents and affording the corresponding
product in good to excellent yields in this reaction.
yields with a high selectivity. The use of biodegradable solid acid catalyst, cellulosesulfonic acid makes this method quite simple, more convenient, and practical. This catalyst was also found to be very active for the synthesis of hydroxyalkylquinazolin-4-ones from cyclicenolethers.