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
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.
A phosphine-catalyzed [3 + 2] annulation of Morita–Baylis–Hillman (MBH) carbonates with 3-methyl-4-nitro-5-styrylisoxazoles has been developed to afford various multifunctional isoxazoles in moderate to good yields with moderate to excellent diastereoselectivities. With a spirocyclic chiral phosphine as the catalyst, up to 89% ee was obtained.