A FACILE AND NEW METHOD FOR THE SYNTHESIS OF α-ARYL-N-METHYLNITRONES IN SOLVENT-FREE MEDIA USING SILICA GEL-NaOH
作者:M. M. Alavi Nikje、M. A. Bigdeli、H. Imanieh
DOI:10.1080/10426500490463790
日期:2004.8
N-methylhydroxylamine hydrochloride and benzaldehydes in solvent-free media using silica-gel–NaOH catalyst system. The yields are excellent regardless of the electron-donating or electron-accepting nature of the substituents on benzaldehyde. Similar ketones are unreactive under these conditions, rendering chemoselectivity of the method.
An efficient [3+2] cycloaddition of nitrones and carbodiimides has been developed. This 1,3-dipolar cycloaddition features high regioselectivity, mild and metal-free conditions, excellent functional group compatibility, and a broad substrate scope. The X-ray structures of two regio-isomers confirmed the regioselectivity of this transformation.
4-Dimethylaminopyridine-Mediated [3+3] Cycloaddition of Aza-oxyallyl Cations and Nitrones
作者:Qianfa Jia、Dongli Li、Ming Lang、Kun Zhang、Jian Wang
DOI:10.1002/adsc.201700415
日期:2017.11.10
A new 4‐dimethylaminopyridine (DMAP)‐mediated [3+3] cycloaddition reaction of in situ‐ generated aza‐oxyallylcations with nitrones is reported. This simple and efficient method delivers a series of new motifs in good to excellent yields under mild conditions.