Copper(I)-catalyzed synthesis of thienopyrazoloquinazolinone derivatives under ligand-free conditions
作者:Wen-Ting Zhang、Dong-Sheng Chen、Mei-Mei Zhang、Xiang-Shan Wang
DOI:10.1007/s11164-016-2497-8
日期:2016.8
synthesized by reaction of 2-aminobenzohydrazide and 3-bromothiophene-2-carbaldehyde in good yields. The reaction includes subsequent condensation, cyclization, and CuBr-catalyzed Ullmann-type reaction underligand-freeconditions. Graphical Abstract
摘要 通过2-氨基苯甲酰肼与3-溴噻吩-2-的反应合成了一系列稠合的四环噻吩并[3',2':3,4]吡唑并[5,1- b ]喹唑啉-6(4 H)-一衍生物。甲醛收率高。该反应包括随后的缩合,环化和在无配体的条件下CuBr催化的Ullmann型反应。 图形概要
The Chemo-selective Reaction of 2-Amino-<i>N′</i>
-arylbenzohydrazide and Ketonic Acid Catalyzed by Iodine for the Synthesis of Quinazoline Derivatives
作者:Jian-Quan Liu、Wen-Ting Zhang、Xiang-Shan Wang
DOI:10.1002/jhet.3228
日期:2018.8
The chemo‐selective reaction of 2‐amino‐N′‐arylbenzohydrazide and ketonic acid catalyzed by iodine was used to synthesize various 2,3‐dihydroquinazolin‐4(1H)‐ones efficiently. The use of levulinic acid furnished a series of 2,3,3a,4‐tetrahydropyrrolo[1,2‐a]quinazoline‐1,5‐diones in high yields, while acetobutyric acid only afforded the quinazoline skeletons without forming the second pyridine ring
碘催化2-氨基N'-芳基苯并肼与酮酸的化学选择性反应可有效合成各种2,3-二氢喹唑啉-4(1 H)-酮。乙酰丙酸的使用可高收率地提供一系列2,3,3 a,4-四氢吡咯并[1,2- a ]喹唑啉-1,5-二酮,而乙酰丁酸仅提供了喹唑啉骨架而未形成第二个吡啶戒指。使用醇代替离子液体作为溶剂,随后以一锅法对乙酰丁酸底物的羧基进行酯化反应。
An efficient synthesis of quinazoline or pyrrolo[1,2-a]quinazolin-5(1H)-one derivatives in ionic liquids catalyzed by iodine
作者:Jian-Quan Liu、Fang Dong、Wen-Ting Zhang、Xiang-Shan Wang
DOI:10.1007/s11164-017-3020-6
日期:2017.12
iodine-catalyzed reaction of 2-amino-N′-arylbenzohydrazides and haloketones was carried out in ionicliquids and was found in good chemoselectivity. 5-Chloropentan-2-one selectively gave fused pyrrolo[1,2-a]quinazolin-5(1H)-onederivatives, and 6-chlorohexan-2-one only formed simple quinazolin-4(1H)-ones, while the second cyclization did not take place at all. Graphical Abstract
摘要 2-氨基-N'-芳基苯甲酰肼与卤代酮的碘催化反应在离子液体中进行,发现具有良好的化学选择性。5-氯opentan-2-one有选择地生成稠合的吡咯并[1,2- a ]喹唑啉-5(1 H)-one衍生物,而6-氯己酮-2-one仅形成简单的喹唑啉-4(1 H)-one,而第二个环化根本没有发生。 图形概要
Formation of Csp2-N bond under metal-catalyst-free conditions for the synthesis of pyridopyrazoloquinazoline derivatives
作者:Chao Li、Wen-Qiang Lu、Mei-Mei Zhang、Xiang-Shan Wang
DOI:10.1007/s00706-015-1547-z
日期:2016.4
A series of pyrido[2',3':3,4]pyrazolo[5,1-b]quinazolin-10(12H)-one derivatives were obtained by a reaction of 2-aminobenzohydrazides and 2-chloropyridine-3-carbaldehydes catalyzed by iodine in the presence of Cs2CO3. A feature of the procedure is the formation of Csp(2)-N bond under metal-catalyst-free conditions.