A new reaction of 4-arylidene-3-methylisoxazol-5(4H)-one or 4-arylidene-2-phenyloxazol-5(4H)-one with 2,6-diaminopyrimidin-4(3H)-one is described and a number of new pyrido[2,3-d]pyrimidine-4,7-dione derivatives are synthesized. This protocol has the advantages of good yields, broad substrate scope and simple work-up.
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.
Developing a cost effective and environmentally benign solvent system is of the utmost importance in the chemical industry. One current proposal is the replacement of conventional hazardous volatil...
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。
Sonochemical synthesis of 3-methyl-4-arylmethylene isoxazole-5(4H)-ones by amine-modified montmorillonite nanoclay
作者:Javad Safari、Majid Ahmadzadeh、Zohre Zarnegar
DOI:10.1016/j.catcom.2016.08.018
日期:2016.11
Ultrasound irradiation was applied for the rapid and clean synthesis of 3-methyl-4-arylmethylene isoxazole-5(4H)-ones through condensation of hydroxylamine hydrochloride, ethyl acetoacetate and benzaldehyde derivatives. This methodology was effectively catalyzed by amine functionalized montmorillonite K10 nanoclay (NH2-MMT). Compared with conventional methods, this protocol has promising features for