Cesium Carboxylate-Promoted Iridium Catalyzed C–H Amidation/Cyclization with 2,2,2-Trichloroethoxycarbonyl Azide
作者:Tao Zhang、Zhen Wang、Xuejiao Hu、Meng Yu、Tianning Deng、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.6b00818
日期:2016.6.3
An Ir(III)-catalyzed direct C–H amidation/cyclization of benzamides using 2,2,2-trichloroethoxycarbonyl azide (TrocN3) as the aminocarbonyl source is reported. With the aid of cesium carboxylate, the reactions proceed efficiently and with high regioselectivity, producing various functionalized quinazoline-2,4(1H,3H)-diones, which are important building blocks and key synthetic intermediates for biologically
Palladium-Catalyzed Incorporation of Two C1 Building Blocks: The Reaction of Atmospheric CO<sub>2</sub> and Isocyanides with 2-Iodoanilines Leading to the Synthesis of Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Pei Xu、Fei Wang、Tian-Qi Wei、Ling Yin、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.7b01877
日期:2017.9.1
insertion and cycloaddition of CO2 and isocyanide into 2-iodoanilines under atmospheric pressure has been developed and affords quinazoline-2,4(1H,3H)-diones through the formation of new C–C, C–O, and C–N bonds under mild conditions. This reaction provides a new and practical method not only for the construction of quinazoline-2,4(1H,3H)-diones but also for the efficient utilization of carbon dioxide.
Palladium-Catalyzed Cyclization Reaction of <i>o</i>
-Haloanilines, CO<sub>2</sub>
and Isocyanides: Access to Quinazoline-2,4(1<i>H</i>
,3<i>H</i>
)-diones
作者:Wen-Zhen Zhang、Honglin Li、Yang Zeng、Xueyan Tao、Xiaobing Lu
DOI:10.1002/cjoc.201700581
日期:2018.2
important compounds. The reaction of 2‐aminobenzonitrile and CO2, which was frequently studied, only provided N3‐unsubstituted quinazoline‐2,4(1H,3H)‐dione compounds. Herein we report palladium‐catalyzed cyclizationreactions of o‐haloanilines, CO2 and isocyanides to prepare N3‐substituted quinazoline‐2,4(1H,3H)‐diones. Electron‐rich o‐bromoanilines participated in the cyclizationreaction using Cs2CO3 at
The chemistry of azides derived from N-substituted phthalamic and tetrahalogenophthalamic acids
作者:Ting Keung Au、Ahmet E. Baydar、Gerhard V. Boyd
DOI:10.1039/p19810002884
日期:——
o-carbamoylbenzoyl azides (2), which yielded o-carbamoylphenyl isocyanates (4) when heated. The isocyanates derivedfrom tertiary phthalamic acids formed 4-dialkyl ammonio-1,4-dihydro-2H-3,1-benzoxazin-2-one perchlorates (8) by the action of perchloric acid and acetic anhydride; those containing secondary amide groups cyclised to 3-alkyl-quinazoline-2,4-(1H,3H)-diones (11) at rates depending on the size of the
用叠氮化钠处理八种高氯酸邻苯二甲亚氨酸钠,得到N-取代的邻氨基甲酰基苯甲酰基叠氮化物(2),加热时得到邻氨基甲酰基苯基异氰酸酯(4)。衍生自叔邻苯二甲酸的异氰酸酯在高氯酸和乙酸酐的作用下形成4-二烷基铵-1,4-二氢-2 H -3,1-苯并恶嗪-2-一高氯酸盐(8)。那些含有仲酰胺基的化合物以取决于烷基基团大小的速率环化成3-烷基-喹唑啉-2,4-(1 H,3 H)-二酮(11)。四氯和四溴邻苯二甲酸酐与胺反应生成相应的酰胺酸,其盐或N-取代的3-氨基-4-羟基邻苯二甲酸酯。在衍生自两种叔四氯邻苯二甲酸的叠氮化物的情况下,也观察到环链异构现象。
Synthesis of <i>N</i>-Unsubstituted and <i>N</i>3-Substituted Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones from <i>o</i>-Aminobenzamides and CO<sub>2</sub> at Atmospheric Pressure and Room Temperature
作者:Lin Zhang、Qian Chen、Linlin Li、Nana Ma、Jie Tian、Hao Sun、Qian Xu、Yuanyong Yang、Chun Li
DOI:10.1021/acs.orglett.3c00614
日期:2023.4.14
The unprecedented metal-free synthesis of both N-unsubstituted and N3-substituted quinazoline-2,4(1H,3H)-diones from o-aminobenzamides and CO2 under atmospheric pressure at room temperature is developed. This protocol easily allows for variations of functional groups (including alkyl, aryl, and heterocycle groups) at the N3-position to accommodate the construction of many important drugs and bioactive
开发了在大气压和室温下从邻氨基苯甲酰胺和 CO 2空前无金属合成N-未取代和N 3-取代喹唑啉-2,4(1 H ,3 H ) -二酮的方法。该协议很容易允许N 3 位的官能团(包括烷基、芳基和杂环基团)发生变化,以适应许多重要药物和生物活性化合物的构建。该反应具有生态友好、底物范围耐受性和多功能性的特点,甚至可以在克级实施。