Fe3O4@SiO2-NH2 Nanocomposite as a Robust and Effective Catalyst for the One-pot Synthesis of Polysubstituted Dihydropyridines
作者:Mohammad Ali Ghasemzadeh、Mohammad Hossein Abdollahi-Basir
DOI:10.17344/acsi.2016.2386
日期:2016.9.15
A practical, simple and efficient method for the synthesis of polysubstituted dihydropyridines was described via multicomponent reactions of aldehydes, arylamines, dimethyl acetylenedicarboxylate and malononitrile/ ethyl acetoacetate in the presence of Fe3O4@SiO2-NH2 nanocomposites. The present methodology provides a novel and efficient method for the synthesis of dihydropyridine derivatives with some advantages, such as excellent yields, short reaction times, recoverability and low catalyst loading. The nanomagnetic catalyst could be readily recovered using an external magnet and reused several times without any significant loss in activity. The catalyst was fully characterized by FT-IR, SEM, XRD, EDX and VSM analysis.
Visible-light-induced organophotocatalytic and singlet oxygen-initiated domino construction of 1,4-dihydropyridines, C-3 functionalized spiro[indoline-3,4′-pyridines] and C-11 functionalized spiro[indeno-[1,2-<i>b</i>]quinoxaline-11,4′-pyridines]
作者:Biplob Borah、Mihir Patat、Vipin Singh、Murugesan Sivaprakash、Madavi S. Prasad、L. Raju Chowhan
DOI:10.1039/d3ob00043e
日期:——
method for the construction of pharmacologically potent structurally functionalized 1,4-dihydropyridines, quaternary centered C-3 functionalized spiro[indoline-3,4′-pyridines], and C-11 functionalized spiro[indeno[1,2-b]quinoxaline-11,4′-pyridines] via rose bengal photoredox catalysis under blue LED irradiation in an aqueous medium at room temperature has been developed. The products were isolated in excellent
一种高效的盆栽、原子和步骤经济方法,用于构建具有药理作用的结构功能化 1,4-二氢吡啶、季中心 C-3 功能化螺 [indoline-3,4'-吡啶] 和 C-11 功能化螺[已经开发了在室温下在水性介质中在蓝色 LED 照射下通过玫瑰红光氧化还原催化茚并[1,2- b ]喹喔啉-11,4'-吡啶] 。在具有高反应质量效率和过程质量强度的绿色溶剂系统中,在无过渡金属和无配体的节能条件下,产品在短反应时间内以优异的收率分离出各种官能团,这是关键优势目前的工作。