Niacin as a Potent Organocatalyst towards the Synthesis of Quinazolines Using Nitriles as C-N Source
作者:Raghuram Gujjarappa、Nagaraju Vodnala、Velma Ganga Reddy、Chandi C. Malakar
DOI:10.1002/ejoc.201901651
日期:2020.2.21
An organocatalyzed protocol has been described for the comprehensive synthesis of 2‐substituted quinazolines usingnitriles as C–N source. The developed reaction conditions are suitable for a wide range of substrates providing the desired products in excellent yields.
Ultrasound-Assisted Preparation of Copper(I) Oxide Nanocubes: High Catalytic Activity in the Synthesis of Quinazolines
作者:Amol B. Raut、Abhishek R. Tiwari、Bhalchandra M. Bhanage
DOI:10.1002/cctc.201601330
日期:2017.4.7
energy‐dispersive X‐ray spectroscopy, UV/Vis spectroscopy, differential scanning calorimetry with thermogravimetric analysis, and FTIR spectroscopy. The Cu2O nanocubes were employed as a heterogeneous nanocatalyst and were found to be highly active in the preparation of quinazolines by the tandem cyclization of 2‐bromobenzaldehydes with amidines under ligand‐free conditions. Various quinazolines could be prepared
Copper-catalyzed domino reaction between 1-(2-halophenyl)methanamines and amidines or imidates for the synthesis of 2-substituted quinazolines
作者:Mohamed A. Omar、Jürgen Conrad、Uwe Beifuss
DOI:10.1016/j.tet.2014.02.066
日期:2014.5
between 1-(2-bromophenyl)methanamines and amidines using K3PO4 as the base, pivalic acid as the additive, and aerial oxygen as the oxidant gives access to substituted quinazolines in a single step with yields in the range between 43 and 90%. It is assumed that the reaction proceeds as a Cu(I)-catalyzed intermolecular N-arylation followed by an intramolecularnucleophilic substitution and a Cu(II)-catalyzed
以K 3 PO 4为碱,新戊酸为添加剂,空气中的氧气为氧化剂的1-(2-溴苯基)甲胺和am之间的CuI催化的多米诺反应使一步反应可得到取代的喹唑啉范围介于43%和90%之间。假定该反应以Cu(I)催化的分子间N-芳基化进行,然后进行分子内亲核取代和Cu(II)催化的氧化。am可以被酰亚胺取代,反应也可以与1-(2-碘苯基)甲胺一起进行。
Copper-Catalyzed Synthesis of Quinazolines in Water Starting from o-Bromobenzylbromides and Benzamidines
作者:Chandi C. Malakar、Alevtina Baskakova、Jürgen Conrad、Uwe Beifuss
DOI:10.1002/chem.201200583
日期:2012.7.16
Water makes it possible: The Cu2O‐catalyzed reaction between easily available o‐bromobenzylbromides and benzamidines by using Cs2CO3 as the base and N,N′‐dimethylethylenediamine (DMEDA) as the additive in water as the solvent gives access to substituted quinazolines in a single step with yields ranging from 57 to 85 % (see scheme).
水使成为可能:通过使用Cs 2 CO 3作为碱和N,N'-二甲基乙二胺(DMEDA)作为在水中的添加剂作为溶剂,Cu 2 O催化易得的邻溴代溴化苄与苄am之间的反应一步即可取代取代的喹唑啉,产率为57%至85%(请参阅方案)。
Sulfur-Mediated Decarboxylative Coupling of 2-Nitrobenzyl Alcohols and Arylacetic Acids
作者:Tung T. Nguyen、Nam T. S. Phan、Khang X. Nguyen、Duyen K. Nguyen、Phuc H. Pham、Ha V. Le
DOI:10.1055/s-0040-1707113
日期:2020.7
the use of urea as a nitrogen source, elemental sulfur as a promoter, DABCO as a base, and DMSO as a solvent. Functionalities such as chloro, fluoro, trifluoromethyl, thienyl, and indolyl groups were all compatible with the reaction conditions. Because our method uses stable simple substrates to obtain the N,N-heterocycles in the absence of transition metals, it offers a potential pathway for preparing