efficient and multicomponent approach for the synthesis of novel polyheterocyclic spiropyrrolidinylindenoquinoxalines via 1,3 dipolar [3+2] cycloaddition reaction of 3-methyl-4-nitro-5-alkenylisoxazoles, ninhydrin, orthophenylenediamine and benzyl amine. Excellent to good yields were obtained. Various isoxazole derivatives were used as dipolarophiles against substituted benzylamine and o-phenylenediamine.
The highly chemoselective transfer hydrogenation of the carbon–carbon double bond of conjugated nitroalkenes by a rhodium complex
作者:Jing Xiang、Er-Xiao Sun、Chun-Xia Lian、Wei-Cheng Yuan、Jin Zhu、Qiwei Wang、Jingen Deng
DOI:10.1016/j.tet.2012.04.028
日期:2012.6
Chemoselective transfer hydrogenation of conjugatednitroalkenes catalyzed by [RhCl2Cp∗]2–diamine complex (Cp∗=η5-C5Me5) using HCOOH/Et3N (5:2) (TEAF) as a hydrogen source was realized. A variety of nitrostyrenes, β-methyl nitrostyrenes, and 3-methyl-4-nitro-5-alkenyl-isoxazoles were reduced smoothly in good to excellent yields in short reaction time. Other functional groups are inert under the reaction
Tandem grinding reactions involving aldol condensation and Michael addition in sequence for synthesis of 3,4,5-trisubstituted isoxazoles
作者:Xiao-Mu Hu、Hai Dong、Yue-Dan Li、Ping Huang、Zhuang Tian、Ping-An Wang
DOI:10.1039/c9ra04864b
日期:——
A one-pot, base-catalyzed, tandem grinding process involving carrying out aldol condensation and Michael addition in sequence to produce 3,4,5-trisubstituted isoxazoles from 3,5-dimethyl-4-nitroisoxazole, aromatic aldehydes and activated methylene compounds has been developed. In the presence of 10 mol% of pyrrolidine, aldol condensations of 3,5-dimethyl-4-nitroisoxazole with various aromatic aldehydes
一种一锅、碱催化、串联研磨工艺,包括依次进行醇醛缩合和迈克尔加成,由3,5-二甲基-4-硝基异恶唑、芳香醛和活化的亚甲基化合物生产3,4,5-三取代异恶唑,已开发。在 10 mol% 吡咯烷存在下,3,5-二甲基-4-硝基异恶唑与各种芳香醛进行羟醛缩合,研磨 3-10 分钟,得到良好的 5-苯乙烯基-3-甲基-4-硝基异恶唑。无需进一步纯化即可达到定量收率。然后,在 10 mol% Et 3 N 存在下,在同一研钵中进行 5-苯乙烯基-3-甲基-4-硝基异恶唑与活化亚甲基化合物(包括 2-硝基乙酸乙酯和 2-氰基乙酸烷基酯)之间的迈克尔加成反应。连续研磨 3-5 分钟即可以良好至优异的产率生产 3,4,5-三取代异恶唑。
An efficient solvent-free synthesis of 3-methyl-4-nitro-5-styrylisoxazoles using solid nano-titania
作者:Kartikey Dhar Dwivedi、Sameer Reddy Marri、Satish Kumar Nandigama、Raju L Chowhan
DOI:10.1007/s12039-018-1534-0
日期:2018.9
sustainability of the catalyst was tested by performing recyclability experiment up to 4 cycles. Calculated turn over frequency (TOF) for each cycle indicates the protocol as sustainable. Graphical Abstract: SYNOPSISAn efficient and solvent-free procedure for the synthesis of 3-methyl-4-nitro-5-styrylisoxazoles using nano-titania as solid support and recyclablecatalyst is presented. This method provides a useful
One-pot synthesis of functionalized isoxazole–thiolane hybrids via Knoevenagel condensation and domino sulfa-1,6-Michael/intramolecular vinylogous Henry reactions
作者:Sakkani Nagaraju、Neeli Satyanarayana、Banoth Paplal、Anuji K. Vasu、Sriram Kanvah、Balasubramanian Sridhar、Prabhakar Sripadi、Dhurke Kashinath
DOI:10.1039/c5ra16721c
日期:——
One-pot synthesis of isoxazole–thiolane hybrids are reported via the Knoevenagel condensation, domino sulfa-1,6-Michael/intramolecular vinylogous Henry reactions using piperidine (30 mol%) with >95% yields in 2–2.5 h overall reaction time.