Synthesis of 2,3-dihydroquinazolin-4(1<i>H</i>)-ones from anthranilamide and ketones over Hβ zeolite in aqueous media*
作者:Krishna Sai Gajula、Naresh Mameda、Srujana Kodumuri、Durgaiah Chevella、Rammurthy Banothu、Vasu Amrutham、Boris Ivanovich Kutepov、Narender Nama
DOI:10.1080/00397911.2018.1506033
日期:2018.11.17
Abstract The synthesis of 2,3-dihydroquinazolin-4(1H)-ones by cyclocondensation of anthranilamide with ketones in aqueous media using Hβ zeolite is reported. The scope of the reaction was explored by various ketones such as aromatic, aliphatic and cyclic ketones. Based on the preliminary mechanistic results, a tentative mechanism for the formation of 2,3-dihydroquinazolin-4(1H)-ones using zeolite catalyst
protocol has been developed for the synthesis of 2,3-dihydroquinazolinone compounds from anthranilamide and aldehydes or ketones via ionicliquidcatalyzed cyclization reaction. The reaction features high efficiency, shorter reaction duration, mild reaction conditions and inexpensive reagents. The catalyst was recovered and reused. The recyclability of ionicliquid resulted in excellent yields of products
Synthesis of Flavanone and Quinazolinone Derivatives from the Ruthenium-Catalyzed Deaminative Coupling Reaction of 2′-Hydroxyaryl Ketones and 2-Aminobenzamides with Simple Amines
作者:Krishna Gnyawali、Pandula T. Kirinde Arachchige、Chae S. Yi
DOI:10.1021/acs.orglett.1c03870
日期:2022.1.14
deaminative coupling reaction of 2′-hydroxyaryl ketones with simple amines to form 3-substituted flavanone products. The analogous deaminative coupling reaction of 2-aminobenzamides with branched amines directly formed 3,3-disubstituted quinazolinone products. The catalytic method efficiently installs synthetically useful flavanone and quinazolinone core structures without employing any reactive reagents.
protocol to access heterocyclic dihydroquinazolinones by a transition-metal-free process, involving the reaction of 2-aminobenzonitriles with aldehydes in the presence of KOtBu. The method is compatible with aromatic ketones providing 2,2-disubstituted dihydroquinazolinones in high yields. This reaction proceeds feasibly at room temperature and features a broad substrate scope and tolerance to a range
我们在此报告了一种通过无过渡金属工艺获得杂环二氢喹唑啉酮的有效合成方案,包括在 KO t Bu存在下 2-氨基苯甲腈与醛的反应。该方法与芳族酮兼容,以高产率提供 2,2-二取代二氢喹唑啉酮。该反应在室温下可行,具有广泛的底物范围和对一系列官能团的耐受性。该机制遵循激进的途径。
Heterocyclic reaction inducted by Brønsted–Lewis dual acidic Hf-MOF under microwave irradiation
作者:Linh Ho Thuy Nguyen、Trang Thi Thu Nguyen、Minh-Huy Dinh Dang、Phuong Hoang Tran、Tan Le Hoang Doan
DOI:10.1016/j.mcat.2020.111291
日期:2021.1
Use of green chemistry and alternative strategies has been explored to prepare diverse organic derivatives. The combination between heterogeneous catalyst, environmentally benign reaction and high-yielding methods is gaining momentum. Herein, a defective 6-connected Hf-MOF, named Hf-BTC, was efficiently synthesized and characterized for the heterogeneous catalysis undermicrowaveirradiation. The MOF