Application of {[4,4′-BPyH][C(CN)3]2} as a Bifunctional Nanostructured Molten Salt Catalyst for the Preparation of 2-Amino-4H-chromene Derivatives under Solvent-Free and Benign Conditions
作者:Mohammad Zolfigol、Meysam Yarie、Saeed Baghery
DOI:10.1055/s-0035-1561345
日期:——
The bifunctionalnanostructured molten salt [4,4′-bipyridine]-1,1′-diium tricyanomethanide has been employed as a highly efficient and powerful catalyst for the preparation of 2-amino-4H-chromenes. A wide variety of aromatic aldehydes was condensed with malononitrile and resorcinol, 1-naphthol or 2-naphthol under mild and solvent-free conditions. This protocol has the advantages of short reaction times
A green route towards substituted 2-amino-4H-chromenes catalyzed by an organobase (TBD) functionalized mesoporous silica nanoparticle without heating
作者:Bikash Karmakar、Rajesh Nandi
DOI:10.1007/s11164-016-2755-9
日期:2021.5
1,5,7-Triazabicyclo-[4,4,0]-dec-1-ene functionalized mesoporous silica nanoparticle promoted one-pot multicomponent synthesis of 2-amino-4H-chromenes from a phenolic component, different aldehydes and malononitrile was achieved in aqueous media at room temperature. The methodology promises advantages of short reaction times, environmentally benign conditions, high yields, and operational convenience
65 ± 1.13, 92 ± 1.18, 30 ± 1.17 and 16 ± 1.10 µM) than curcumin drug (48 ± 1.11 µM). Molecular docking was also performed with active compounds 6, 7 and 15 against Bcl-2 protein which gave good binding affinity (ΔG = −9.08, −8.29 and −7.70 kcal/mol) respectively. Furthermore, the structure-activity relationship (SAR) analysis revealed that the chromene and quinoline moieties, when attached with pyrimide
New ruthenium(<scp>ii</scp>) catalysts enable the synthesis of 2-amino-4<i>H</i>-chromenes using primary alcohols <i>via</i> acceptorless dehydrogenative coupling
作者:Veerappan Tamilthendral、Rengan Ramesh、Jan Grzegorz Malecki
DOI:10.1039/d2nj03268f
日期:——
acceptorless dehydrogenative coupling of substituted benzyl alcohols, resorcinol, and malononitrile. The present catalytic protocol furnishes a variety of 2-amino-4H-chromenes in high yields of up to 95% from a wide range of readily available primary alcohols without the use of any oxidant/additives utilizing low catalyst loading. A plausible mechanism for the catalytic synthesis of 2-amino-4H-chromene compounds
通过包含 N-O 螯合咔唑基腙配体的对伞花烃 Ru( II ) 有机金属络合物催化的一锅多组分反应,合成了一系列具有不同取代基功能的具有生物学意义的 2-氨基-4 H-色烯。使用各种光谱(FT-IR、UV-vis、NMR 和 HR-MS)和分析方法合成和表征了一组对伞花烃 Ru( II ) 配合物。借助单晶 X 射线衍射研究证实了其中一种配合物的分子结构。2-氨基-4 H-色烯衍生物已在温和条件下通过钌( II) 催化剂介导的取代苯甲醇、间苯二酚和丙二腈的无受体脱氢偶联。本催化协议提供了各种 2-氨基-4 H-色烯,从各种容易获得的伯醇中以高达 95% 的高产率提供,而无需使用任何利用低催化剂负载的氧化剂/添加剂。通过醛和亚苄基丙二腈中间体的形成以及水和氢作为副产物的排放,已经描述了催化合成 2-氨基-4 H-色烯化合物的合理机制。有趣的是,从合成的 2-氨基-4 H-色烯中成功构建了具有良好收率的药用重要的他克林类似物。
The development of knoevenagel-michael cyclocondensation through a single-electron transfer (SET)/energy transfer (EnT) pathway in the use of methylene blue (MB+) as a photo-redox catalyst
作者:Farzaneh Mohamadpour
DOI:10.1016/j.jphotochem.2022.114120
日期:2022.11
the Knoevenagel-Michael cyclocondensation of malononitrile, aryl aldehydes, and resorcinol, a multicomponent green tandem method for the metal-free synthesis of 2-amino-4H-chromene scaffolds was developed. At room temperature in an aqueous solvent, photo-excited state functions formed from methylene blue (MB+) were used as single-electron transfer (SET) and energy transfer (EnT) catalysts using visible