Synthesis of C, N-diaryl Nitrones from the Reduction of Nitroarene with Aromatic Aldehydes Promoted by Metallic Samarium
作者:Xueshun Jia、Dafeng Li、Qing Huang、Li Zhu、Jian Li
DOI:10.3184/030823407x218057
日期:2007.5
A mild and facile reduction of nitroarene with aromatic aldehydes promoted by metallic samarium to C, N-diaryl nitrones in moderate yields has been developed.
A new and straightforward protocol for the synthesis of quinoline N‐oxides from the annulation of arylnitrones and alkynes is described. For the first time, a [4+2] cyclization of nitrone and alkynes has been achieved by cobalt catalysis via a nitrone‐assisted dualC–H cleavage under relatively mild conditions.
metal-free approach for the ʟ-proline mediated synthesis of nitrones from nitrosobenzene and benzaldehydes has been established. The reaction undergoes very efficiently at room temperature in methanol as a solvent. The reaction is assumed to involve that the initial formation of azomethine ylide and [2 + 3] cycloaddition of nitrosobenzene, followed by the subsequent retro [2 + 3] cycloaddition could offer
Cooperative Silver- and Base-Catalyzed Diastereoselective Cycloaddition of Nitrones with Methylene Isocyanides: Access to 2-Imidazolinones
作者:Yan Chen、Yijing Wu、Andrey Shatskiy、Yuhe Kan、Markus D. Kärkäs、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1002/ejoc.202000437
日期:2020.6.23
A protocol involving cooperative silver‐ and base‐catalyzed diastereoselective cycloaddition of nitrones with isocyanides is described, delivering several valuable 2‐imidazolinones derivatives as single diastereomers. A plausible reaction mechanism is rationalized by DFT calculations. DBU plays dual roles in the developed reaction, acting as both the base and ligand.
Regio- and stereo-selective synthesis of carbohydrate isoxazolidines by 1,3-dipolar cycloaddition of nitrones to 5,6-di-deoxy-1,2- O -isopropylidene-α- d - xylo -hex-5-enofuranose
The synthesis of 2-phenyl-3-aryl and 2-phenyl-3-aroyl derivatives 5-(1,2-O-isopropylidene-alpha-D-xylo-tetrofuranos-4-yl)isoxazolidi ne (3) from nitrones and 5,6-dideoxy-1,2-O-isopropylidene-alpha-D-xylo-hex-5- enofuranose (1) is described. The 1,3-dipolar cycloaddition reactions given mainly anti adducts 3 and 4 (greater than or equal to 95% pi-facial stereoselectivity). The cycloadducts 3 with H-3