Synthesis, structure and photoluminescent properties of BF2 and BPh2 complexes with N,O-benzazine ligands
摘要:
Novel N,O-bidentate BF2 and BPh2 complexes have been prepared in good to excellent yields through coordination of 8-hydroxy-2-methylquinolines and 2-(2-hydroxyphenyl)-3H-quinazolin-4-ones with boron trifluoride etherate or triphenylborane under mild conditions. All complexes have been characterized by H-1, B-11 and F-19 NMR, mass-spectrometry and X-ray crystallography data. Some complexes have been found to exhibit a significant fluore.scence in acetonitrile solutions. Electronic and site effects of substituents in both heterocyclic and phenol fragments proved to have a profound impact on quantum yields. (C) 2015 Elsevier B.V. All rights reserved.
Synthesis, structure and photoluminescent properties of BF2 and BPh2 complexes with N,O-benzazine ligands
摘要:
Novel N,O-bidentate BF2 and BPh2 complexes have been prepared in good to excellent yields through coordination of 8-hydroxy-2-methylquinolines and 2-(2-hydroxyphenyl)-3H-quinazolin-4-ones with boron trifluoride etherate or triphenylborane under mild conditions. All complexes have been characterized by H-1, B-11 and F-19 NMR, mass-spectrometry and X-ray crystallography data. Some complexes have been found to exhibit a significant fluore.scence in acetonitrile solutions. Electronic and site effects of substituents in both heterocyclic and phenol fragments proved to have a profound impact on quantum yields. (C) 2015 Elsevier B.V. All rights reserved.
Abstract An efficientsynthesis of 2-substituted and 2,3-disubstituted quinazolin-4(3H)-onesviatandem reaction of anthranilamides and aromatic aldehydes catalyzed by vanadyl acetylacetonate with 1 mol% loading under an air atmosphere is described. This new method is associated with several advantages such as low catalyst loading (only 1 mol%), use of green oxidant in the form of air, high atom economy
This paper describes the synthesis of 2-substituted and 2,3-disubstituted 4(3H)-quinazolinones via a tandem reaction involving anthranilamides and aromatic aldehydes catalyzed by 3 mol% CuO powder under air atmosphere. This new method has several advantages: it uses recyclable and cheap CuO powder as the catalyst and air as the green oxidant, water is the only byproduct, and the solvent is recycled
and pyrido[2,3-d]pyrimidin-4(3H)-ones from easily available 2-halobenzamides (or 2-halonicotinamides), aldehydes, and sodium azide has been developed, which gave the corresponding target products in 50–95% yields for 29 examples. This remarkable consecutive process involved sequential copper-catalyzed SNAr, reduction, cyclization, and oxidation. Notably, this work would provide a novel synthetic strategy
从容易获得的2-卤代苯甲酰胺(或2-卤代烟酰胺)中高效,实用地铜催化连续合成喹唑啉-4(3 H)-酮和吡啶并[2,3 - d ]嘧啶-4(3 H)-酮,已开发出醛和叠氮化钠,从而使29个实例的相应目标产物收率达到50-95%。这个非同寻常的连续过程涉及连续的铜催化的S N Ar,还原,环化和氧化。值得注意的是,这项工作将为含有喹唑啉酮类骨架的生物活性分子提供一种新颖的合成策略。