Preparation of Heteroarenecarbonitriles by Reaction of Heteroarene N-Oxides with Trimethylsilyl Cyanide in the Presence of DBU
摘要:
Several heteroarenecarbonitriles were prepared from the corresponding heteroarene N-oxides by treatment with trimethylsilyl cyanide (TMSCN) in the presence of a base in tetrahydrofuran (THF). 1,8-Diazabicyclo[5.4.0]-7-undecene (DBU) was found to be an effective base for the cyanation.
An unexpected copper(<scp>ii</scp>)-catalyzed three-component reaction of quinazoline 3-oxide, alkylidenecyclopropane, and water
作者:Yuanyuan An、Danqing Zheng、Jie Wu
DOI:10.1039/c4cc04341c
日期:——
An unexpected copper(II)-catalyzed three-component reaction of quinazoline-3-oxide, alkylidenecyclopropane and water under mild conditions is reported. This transformation including [3+2] cycloaddition and intramolecular rearrangement leads to N-(2-(5-oxa-6-azaspiro[2.4]hept-6-en-7-yl)phenyl)formamides in good yields.
A novel and efficient protocol for the direct C-4alkylation of quinazoline-3-oxides via radical oxidative coupling between quinazoline 3-oxides and ethers in the presence of TBHP was developed. The reaction proceeded smoothly under metal-free conditions, which provided quinazoline-containing heterocyclic molecules in moderate to good yields.
Copper-Catalyzed Oxidative Coupling of Quinazoline-3-Oxides: Synthesis of <i>O</i>-Quinazolinic Carbamates
作者:Lingyun Yang、Yangfei Huang、Weijie Yu、Lijia Fan、Tao Wang、Junkai Fu
DOI:10.1021/acs.joc.1c03098
日期:2022.4.15
chemistry and industry. Despite the fact that the synthesis of alcohol-based carbamates has been well studied, an efficient access to hydroxamic acid-based carbamates is less explored due to the nucleophilicity of both O and N atoms in hydroxamic acids. Herein, we report a copper-catalyzedoxidativecoupling of quinazoline-3-oxides and formamides for the synthesis of O-quinazolinic carbamates. This protocol
有机氨基甲酸酯代表了有机化学和工业中的一种特殊结构。尽管已经对醇基氨基甲酸酯的合成进行了充分研究,但由于异羟肟酸中 O 和 N 原子的亲核性,因此很少探索有效地获得基于异羟肟酸的氨基甲酸酯。在此,我们报道了一种铜催化的喹唑啉-3-氧化物和甲酰胺的氧化偶联,用于合成O-喹唑啉氨基甲酸酯。该协议具有实用性强、起始材料简单、操作简单等特点。
tert-Butyl Hydroperoxide Promoted the Reaction of Quinazoline-3-oxides with Primary Amines Affording Quinazolin-4(3<i>H</i>)-ones
作者:Jin Luo、Juelin Wan、Lianlian Wu、Lingyun Yang、Tao Wang
DOI:10.1021/acs.joc.2c00898
日期:2022.8.5
synthesis of quinazolin-4(3H)-ones via the reaction of quinazoline-3-oxides with primary amines is described. This approach is demonstrated to be applicable for a broad range of substrates and proceeds efficiently under metal-free and mild reaction conditions employing easily available tert-butyl hydroperoxide as the oxidant. Remarkably, 3-(2-(1H-indol-3-yl) ethyl)quinazolin-4(3H)-one 3w, which was conveniently
介绍了一种通过 quinazolin-3-氧化物与伯胺反应合成 quinazolin-4(3 H )-ones 的有效且简便的方法。这种方法被证明适用于广泛的底物,并且在使用容易获得的叔丁基过氧化氢作为氧化剂的无金属和温和的反应条件下有效地进行。值得注意的是,3-(2-(1 H -indol-3-yl) ethyl)quinazolin-4(3 H )-one 3w是通过该方法方便地以 70% 的收率获得的,是合成生物活性吴茱萸碱和鲁坦平。
Preparation of Heteroarenecarbonitriles by Reaction of Heteroarene N-Oxides with Trimethylsilyl Cyanide in the Presence of DBU
Several heteroarenecarbonitriles were prepared from the corresponding heteroarene N-oxides by treatment with trimethylsilyl cyanide (TMSCN) in the presence of a base in tetrahydrofuran (THF). 1,8-Diazabicyclo[5.4.0]-7-undecene (DBU) was found to be an effective base for the cyanation.