Expeditious green synthesis of 3,4-disubstituted isoxazole-5(4H)-ones catalyzed by nano-MgO
作者:Hamzeh Kiyani、Fatemeh Ghorbani
DOI:10.1007/s11164-016-2498-7
日期:2016.9
three-component reaction of hydroxylaminehydrochloride with aryl aldehydes (or heteroaryl aldehydes) and β-oxoesters to synthesize some biologically active isoxazole-5(4H)-one-based heterocycles. The reactions were completed using 3 mol% catalyst loading in aqueous medium at room temperature. Nano-MgO was synthesized by precipitation and hydrothermal treatment of aqueous salt solution. The structure of the
Facile and expedient synthesis of α,β-unsaturated isoxazol-5(4H)-ones under mild conditions
作者:Fatemeh Ghorbani、Hamzeh Kiyani、Seied Ali Pourmousavi
DOI:10.1007/s11164-019-03999-7
日期:2020.1
three-component cyclocondensation of aryl/heteroaryl aldehydes, hydroxylamine hydrochloride, and β -ketoesters toward the synthesis of α , β -unsaturated isoxazol-5(4 H )-ones under green conditions. The reaction yielded the corresponding heterocycles at room temperature in relatively shorter reaction times. It merits mentioning that the mild conditions allow the synthesis of several α , β -unsaturated isoxazol-5(4
摘要 发现芳基/杂芳基醛,羟胺盐酸盐和 β- 酮酸酯的三组分环缩合反应可催化 纳米SiO 2 -H 2 SO 4合成 α , β- 不饱和异恶唑-5(4 H )-在绿色条件下。该反应在室温下以相对较短的反应时间产生相应的杂环。值得一提的是,温和的条件允许合成几种 α , β- 不饱和异恶唑-5(4 H )-使用此方法的人。在这项研究中,还合成并表征了一些新的异恶唑酮衍生物。它高效,清洁,简单,安全且生态友好。这种简单的方法具有成本效益,并且不需要制备反应物。在不使用能量源(例如热,超声波和微波辐射)的情况下进行三组分环化。 图形摘要
Ag/SiO2 as a recyclable catalyst for the facile green synthesis of 3-methyl-4-(phenyl)methylene-isoxazole-5(4H)-ones
作者:Surya Narayana Maddila、Suresh Maddila、Werner E. van Zyl、Sreekantha B. Jonnalagadda
DOI:10.1007/s11164-015-2167-2
日期:2016.3
An efficient and facile green method for synthesis of 3-methyl-4-(phenyl)methylene-isoxazole-5(4H)-one (4a-m) via room temperature reaction of hydroxylamine, ethylacetoacetate and substituted aromatic aldehydes is designed, using Ag/SiO2 as catalyst with water as solvent. This protocol offers several advantages, such as it being a benign, energy conserving and eco-friendly reaction with products obtained in excellent yields (88–93 %). The reaction requires relatively short reaction times (< 1 h), a simple workup procedure with good atom efficiency and easily recoverable catalyst. The heterogeneous catalyst, Ag/SiO2, was fully characterized and is reusable without loss of activity for up to seven cycles with marginal activity loss.
Synthesis of 3-methyl-4-arylmethylene isoxazole-5(4H)-ones by visible light in aqueous ethanol
作者:Forid Saikh、Jhantu Das、Somnath Ghosh
DOI:10.1016/j.tetlet.2013.06.086
日期:2013.8
A highly efficient methodology for the synthesis of 3-methyl-4-arylmethylene-isoxazole-5(4H)-ones has been developed by visible light induced multicomponent reaction of aromatic aldehydes, ethyl acetoacetate, hydroxylamine hydrochloride, and sodium acetate in aqueous ethanol sans any phase transfer catalyst or promoter.
DABCO functionalized dicationic ionic liquid (DDIL): A novel green benchmark in multicomponent synthesis of heterocyclic scaffolds under sustainable reaction conditions
network enhances the overall activity of DDIL. These make them compatible for base catalyzed one pot multicomponentsynthesis of ortho -amino carbonitriles and 3-methyl-4-arylmethylene-isoxazol-5(4 H )-ones under grinding without solvent. In addition the activity of DDIL was also studied for synthesis of tetrahydrobenzo[b]pyrans under ultrasound irradiation in water. Furthermore the DDIL was easily recoverable
摘要 采用二氮杂双环[2,2,2]辛烷(DABCO)、1,3-二氯-2-丙醇和NaBF 4 在乙腈中合成了一种新型DABCO功能化双阳离子离子液体(DDIL)。IL 已通过 IR、NMR 和质谱技术充分表征。IL 中BF 4 - 阴离子的存在通过 19 F NMR 证实并且也得到质量分析的支持。TGA 分析表明,IL 在高达 180 °C 的温度下是热稳定的。我们证明了 DDIL 网络中叔氮位点和羟基的存在增强了 DDIL 的整体活性。这些使它们与碱催化的邻氨基腈和 3-甲基-4-芳基亚甲基-异恶唑-5(4 H )-在无溶剂研磨下的一锅多组分合成相容。此外,还研究了 DDIL 在水中超声照射下合成四氢苯并[b]吡喃的活性。此外,DDIL 易于多次回收和回收,活性适度降低。