在此,我们报道了一种一锅位点选择性双金属催化的C-H二芳基化反应,用于合成多芳基化噻吩和呋喃衍生物,收率高达92%。所开发方法的区域选择性是通过在一个容器内顺序使用两种金属催化剂来实现的,首先是在吖嗪导向基团辅助下进行Ru(II)催化的C3芳基化,然后是Pd(0)催化的C–五元杂环的 C5 位上的 H 官能化。此外,动力学研究表明氮原子在吖嗪部分中的位置对钌催化的芳基化步骤的效率表现出明显的影响。
通过用H 2 O 2-钨酸四氢喹唑啉氧化制备喹唑啉-1-氧化物,并研究了它们的环境光化学性质。报道了在光化学和热条件下,取代基对其光化学环化的影响以及产物1a H- [1,2]恶二叠氮化物[2,3- a ]喹唑啉的反应。喹唑啉-1-氧化物的环化和1a H- [1,2]恶嗪烯丙并[2,3- a ]喹唑啉的反应显示出明显的溶剂同位素和溶剂效应。
Iron-catalyzed oxidative synthesis of N-heterocycles from primary alcohols
作者:Dan Zhao、Yu-Ren Zhou、Qi Shen、Jian-Xin Li
DOI:10.1039/c3ra46363j
日期:——
An iron-catalyzed one-pot one-step oxidative system has been successfully developed in the conversion of primary alcohols into nitrogen-containing heterocycles, such as quinazolinone, quinazoline and 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide derivatives.
在伯醇转化为含氮杂环(如喹唑啉酮,喹唑啉和3,4-二氢-2 H -1,2,4-苯并噻二嗪)中,已成功开发出铁催化的一锅一步氧化系统。1,1-二氧化物衍生物。
Cooperative iridium complex-catalyzed synthesis of quinoxalines, benzimidazoles and quinazolines in water
作者:Kaushik Chakrabarti、Milan Maji、Sabuj Kundu
DOI:10.1039/c8gc03744b
日期:——
Herein, an efficient methodology for the synthesis of a diverse class of N-heterocyclic moieties, such as quinoxalines, benzimidazoles and quinazolines, was developed in water using bio-renewable alcohols. The quinoxalines were successfully synthesized from a wide range of diamines and nitroamines with diols in air. Interestingly, benzimidazoles and quinazolines were synthesized with excellent isolated
A facile and versatile protocol for the one-pot PhI(OAc) 2 mediated divergent synthesis of quinazolines from 2-aminobenzylamine
作者:Moumita Saha、Prasun Mukherjee、Asish R. Das
DOI:10.1016/j.tetlet.2017.04.036
日期:2017.5
be the key reagent in absence or presence of catalytic amount of molecular iodine (I2)/zinc chloride (ZnCl2) to construct quinazoline scaffold from 2-aminobenzylamine and a variety of easily available aldehydes, aryl and aliphatic amines, aliphatic and aryl alcohols and nitriles. This protocol provides mild and robust conditions along with great versatility to synthesize 2-substituted quinazolines from
been prepared by a ruthenium(II)-catalyzed direct ortho-C–H arylation of 2-(aryl/heteroaryl)-substituted quinazolines with (hetero)aryl bromides. Tri(hetero)aryl-substituted alkenes were also prepared by olefinic C–H activation of 2-(2-arylvinyl)quinazoline derivatives. High conversions and selectivities were achieved by choosing the appropriate ruthenium(II) carboxylate catalyst system, solvent, and reaction
通过钌(II)催化的2-(芳基/杂芳基)-取代的喹唑啉与(杂)芳基溴化物的直接邻-C-H芳基化反应制备了一系列偶联产物。三(杂)芳基取代的烯烃也可以通过烯烃 C-H 活化 2-(2-芳基乙烯基)喹唑啉衍生物制备。通过选择合适的羧酸钌 (II) 催化剂体系、溶剂和反应温度,实现了高转化率和选择性。还证明了通过应用芳基化/还原反应序列进行 C(sp3)-H 功能化的可能性。
CuCl/DABCO/4-HO-TEMPO-Catalyzed Aerobic Oxidative Synthesis of 2-Substituted Quinazolines and 4<i>H</i>-3,1-Benzoxazines
Cu/N-ligand/TEMPO catalytic system was first applied to the aerobic oxidative synthesis of heterocycles. As demonstrated, 2-substituted quinazolines and 4H-3,1-benzoxazines were synthesized efficiently from the one-pot reaction of aldehydes with 2-aminobenzylamines and 2-aminobenzyl alcohols, respectively, by employing CuCl/DABCO/4-HO-TEMPO as the catalysts and oxygen as the terminal oxidant.
Cu / N-配体/ TEMPO催化体系首先被用于杂环的好氧氧化合成。如所证明的,通过使用CuCl / DABCO / 4-HO-TEMPO分别由醛与2-氨基苄胺和2-氨基苄醇的一锅反应有效地合成了2-取代的喹唑啉和4 H -3,1-苯并恶嗪。作为催化剂,氧气作为末端氧化剂。