Enantioselective Synthesis of 2-Isoxazolines<i>via</i>Asymmetric 1,3-Dipolar Cycloaddition of Nitrile Oxide to Achiral Allyl Alcohol
作者:Yutaka Ukaji、Kazunori Sada、Katsuhiko Inomata
DOI:10.1246/cl.1993.1847
日期:1993.11
The asymmetric 1,3-dipolarcycloaddition of a nitrile oxide to an achiral allyl alcohol was achieved by the use of (R,R)-diisopropyl tartrate as a chiralauxiliary. Treatment of the allyl alcohol with diethylzinc and the tartrate, followed by the addition of diethylzinc and a hydroximoyl chloride, afforded the corresponding (R)-2-isoxazolines with excellent enantioselectivity.
Palladium-Catalyzed Oxime Assisted Intramolecular Dioxygenation of Alkenes with 1 atm of Air as the Sole Oxidant
作者:Ming-Kui Zhu、Jun-Feng Zhao、Teck-Peng Loh
DOI:10.1021/ja100716x
日期:2010.5.12
This paper describes a palladium-catalyzed oxime assisted intramolecular dioxygenation of alkenes by using 1 atm of air as the sole oxidant under extremely mild conditions, which demonstrated the feasibility of incorporating atmospheric oxygen into synthetically useful products under 1 atm of air at room temperature.