Base free synthesis of iron oxide supported on boron nitride for the construction of highly functionalized pyrans and spirooxindoles
作者:Aniruddha Molla、Sahid Hussain
DOI:10.1039/c5ra21969h
日期:——
BN@Fe3O4 network was synthesized via chemical reduction followed by aerial oxidation in absence of base and was subsequently used for the synthesis of highly functionalized pyrans and spirooxindoles derivatives on water.
Synthesis and antibacterial study of 2-amino-4H-pyrans and pyrans annulated heterocycles catalyzed by sulfated polysaccharide-coated BaFe12O19 nanoparticles
the antibacterial activity of BaFe12O19@IM and the selected compound ( 4a ) toward two types of clinically isolated bacterial strains Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) was evaluated. The results revealed that BaFe12O19@IM and 2-amino-4-(4-chlorophenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4 H -chromene-3-carbonitrile ( 4a ) showed an effective antibacterial activity
摘要据报道, 在该方法中,使用藻类来源的爱尔兰苔藓(IM)的硫酸化多糖作为生物基质和封盖剂,合成了环保的,可磁性回收的BaFe 12 O 19。BaFe 12 O 19 @IM的表征是通过一些物理化学表征工具进行的,例如傅立叶变换红外光谱,X射线粉末衍射,扫描电子显微镜,能量色散X射线光谱,振动样品磁力计和热重分析。在一锅合成2-氨基-4 H中 已探索了引入的多相催化剂的催化性能和可回收性。 -吡喃和吡喃在绿色反应条件下,通过醛,丙二腈和各种C–H活化的酸性化合物之间的三组分反应使杂环化合物环化。这种对环境无害的催化剂显示出高催化活性和有效的可重复使用性,即使经过六次循环运行也可以保持其高催化效率。此外,评价了BaFe 12 O 19 @IM和所选化合物( 4a )对两种临床分离的细菌菌株 大肠杆菌 ( E.coli ) 和金黄色葡萄球菌 ( S.aureus )的抗菌活性。结果表明,BaFe
Green synthesis and antibacterial, antifungal activities of 4H-pyran, tetrahydro-4H-chromenes and spiro2-oxindole derivatives by highly efficient Fe3O4@SiO2@NH2@Pd(OCOCH3)2 nanocatalyst
catalytic performance of this environmentally benign nanocatalyst was investigated in the one-pot multicomponent synthesis of biologically important 2-amino-3-cyano-4H-pyran, tetrahydro-4H-chromenes and spiro2-oxindole derivatives. The reaction was simply achieved via one-pot three-component reaction of arylaldehydes, malononitrile and dimedone/isatins/methylaceto acetate ethanol at room temperature,
一种高效、磁性可回收的 Fe 3 O 4 @SiO 2 @NH 2 @Pd(OCOCH 3 ) 2通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散X射线光谱(EDX)、傅里叶变换红外光谱(FT-IR)、和功率 X 射线衍射。此后,在生物学上重要的 2-氨基-3-氰基-4H-吡喃、四氢-4H-色烯和螺2-羟吲哚衍生物的一锅多组分合成中研究了这种环境友好型纳米催化剂的催化性能。该反应是通过芳醛、丙二腈和二甲酮/靛红/乙酰乙酸甲酯乙醇在室温下的一锅三组分反应实现的,收率高,纯度高。一种新的催化体系,反应介质的可回收性,
A collection of pyrano[3,2-c] chromene, 4H-chromene and 4H-pyran were synthesized in excellent yield employing an innocuous, inexpensive and naturally occurring borax-catalyzed multicomponent domino reaction. The present protocol offers advantages in terms of higher yields, short reactions time and no workup and no column chromatography.
Dibutylamine-catalysed efficient one-pot synthesis of biologically potent pyrans
作者:Reddi Mohan Naidu Kalla、Mi Ri Kim、Il Kim
DOI:10.1016/j.tetlet.2014.12.079
日期:2015.1
expedient, eco-friendly and efficient procedure for the preparation of novel pyran derivatives has been developed through a solvent-free, one-pot reaction of various aldehydes, malononitrile and either methylacetoacetate or ethylbenzoylacetate in the presence of dibutylamine (2.5 mol %) at room temperature. This procedure is advantageous because it is mild, environmentally friendly, gives high yields and requires