Quinazoline skeletons are synthesized by amino acid catabolism/reconstruction combined with the insertion/cyclization of dimethyl sulfoxide for the first time. The amino acid acts as a carbon and nitrogen source through HI-mediated catabolism and is then reconstructed using aromatic amines and dimethyl sulfoxide (DMSO) as a one-carbon synthon. This protocol is of great significance for the further
喹唑啉骨架是首次通过氨基酸分解代谢/重建结合二甲基亚砜的插入/环化合成。氨基酸通过 HI 介导的分解代谢充当碳和氮源,然后使用芳香胺和二甲基亚砜 (DMSO) 作为单碳合成子进行重建。该方案对进一步研究氨基酸转化具有重要意义。
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.
Molecules labeled with fluorine-18 (18F) are used in positron emission tomography to visualize, characterize and measure biological processes in the body. Despite recent advances in the incorporation of 18F onto arenes, the development of general and efficient approaches to label radioligands necessary for drug discovery programs remains a significant task. This full account describes a derisking approach
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。