A domino synthesis of 5,12-dihydroindolo[2,1-b]quinazoline derivatives via copper-catalyzed Ullmann-type intermolecular C–C and intramolecular C–N couplings is reported. Good yields of various 5,12-dihydroindolo[2,1-b]quinazoline derivatives were obtained. Reaction scopes, limitations, and the reaction mechanism are discussed.
据报道,通过铜催化的Ullmann型分子间CC和分子内CN耦合可以合成5,12-二氢吲哚并[2,1- b ]喹唑啉衍生物。获得了各种5,12-二氢吲哚并[2,1- b ]喹唑啉衍生物的良好收率。讨论了反应范围,限制和反应机理。
Synthesis of 2-Aminoquinazolinones via Carbonylative Coupling of <i>ortho</i>-Iodoanilines and Cyanamide
作者:Linda Åkerbladh、Luke R. Odell
DOI:10.1021/acs.joc.6b00249
日期:2016.4.1
describe a convenient and efficient synthesis of 2-aminoquinazolin-4(3H)-ones and N1-substituted 2-aminoquinazolin-4(1H)-ones by a domino carbonylation/cyclization process. The reaction proceeds via carbonylative coupling of readily available ortho-iodoanilines with cyanamide followed by in situ ring closure of an N-cyanobenzamide intermediate. The products were easily isolated by precipitation in moderate
Pd-Catalyzed Ring Assembly by Vinylation and Intramolecular Heck Coupling: A Versatile Strategy Towards Functionalized Azadibenzocyclooctynes
作者:Michael Jäger、Helmar Görls、Wolfgang Günther、Ulrich S. Schubert
DOI:10.1002/chem.201202790
日期:2013.2.4
A new modular approach based on Pd‐catalyzedCC bond formation is presented for the assembly of a benzannulated azocine scaffold, the key intermediate in the synthesis of functionalized azadibenzocyclooctynes (aza‐DIBOs). The intramolecular ring‐closing Heck coupling was investigated by variation of the CX bond. The reaction rate is limited by the initial oxidative addition step and the regiochemistry
基于Pd催化的C A新模块化方法提出了一种用于组装一个苯基环化吖辛因支架,在官能化azadibenzocyclooctynes(氮杂DIBOS)的合成中的关键中间体的C键的形成。通过改变CX键研究了分子内闭环Heck偶联。反应速率受初始氧化加成步骤的限制,区域化学强烈依赖于辅助膦。在最佳条件下,分两步(无保护基团化学反应)或在一个锅中以71%的产率获得8-内基区域异构体,包括CN键的形成。原型N的辛炔三键的实际生成还描述了无需色谱纯化的-苯甲酰基氮杂-DIBO。NMR光谱和X射线晶体学分析阐明了包括环应变环辛炔在内的结构特征。合成的N-苯甲酰基氮杂-DIBO的高反应性在与烷基叠氮化物(k = 0.38 M -1 s -1)促进的叠氮化物-炔烃环加成反应中得到证明。
Bis(dibenzylideneacetone)palladium(0)/<i>tert-</i>Butyl Nitrite- Catalyzed Cyclization of<i>o</i>-Alkynylanilines with<i>tert-</i>Butyl Nitrite: Synthesis and Applications of Indazole 2-Oxides
作者:Gopal Chandru Senadi、Ji-Qi Wang、Babasaheb Sopan Gore、Jeh-Jeng Wang
DOI:10.1002/adsc.201700456
日期:2017.8.17
An efficient method for the synthesis of 1‐benzyl/arylindazole 2‐oxides via a bis(dibenzylideneacetone)palladium(0) [Pd(dba)2]/tert‐butyl nitrite (TBN)‐catalyzed reaction of o‐alkynylaniline derivatives with TBN is reported. The overall transformation involves the formation of three new bonds via N‐nitrosation (N–NO), 5‐exo‐dig cyclization (C–N) and oxidation (C=O). The notable features are the mild
Markovnikov-type sulfonylation/6-endo-trig cyclization/selective C(O)–CF3 bond cleavage starting from N-alkyl-N-(2-ethynylphenyl)-2,2,2-trifluoroacetamides and sulfinicacids has been developed. It is as an unprecedented protocol for the preparation of 4-sulfonylquinoline-2(1H)-ones with high efficiency, mild reaction conditions, acceptable yields and a wide range of substrates.
从N-烷基-N-开始通过马尔科夫尼科夫型磺酰化/6-endo-trig 环化/选择性 C(O)-CF 3键裂解构建 quinolin-2(1 H )-ones的一种新的便捷光催化方案(2-乙炔基苯基)-2,2,2-三氟乙酰胺和亚磺酸已被开发出来。它是一种前所未有的制备 4-磺酰喹啉-2(1 H )-ones 的方案,具有高效、温和的反应条件、可接受的产率和广泛的底物。