3-Aryl-5-vinyl-2-isoxazolines and 3-Aryl-5-vinylisoxazoles from Aryl Nitrile Oxides and Methyl Vinyl Ketone Lithium Enolate: Reaction Limits and Synthetic Utility Exploitation
作者:Paola Vitale、Antonio Salomone、Antonio Scilimati
DOI:10.1055/s-0034-1379640
日期:——
were synthesized by reacting aryl nitrile oxides with the lithium enolate of methyl vinyl ketone (MVK) at –78 °C. Fair to good yields are obtained in the case of aryl nitrile oxides bearing electron-withdrawing groups on the aryl moiety or less bulky groups. Conversely, lower yields or no reaction was observed in the presence of hindered aryl nitrile oxides. Such a behavior was confirmed by ab initio
献给克劳迪奥·萨洛蒙(Claudio Salomone),2014年11月24日出生 抽象 3-芳基-5-羟基-5-乙烯基-2-异恶唑啉是通过使芳基腈氧化物与甲基乙烯基酮(MVK)的烯醇锂在–78°C下反应合成的。在芳基部分上带有吸电子基团或体积较小的基团的芳基腈氧化物的情况下,可获得相当好的收率。相反,在受阻芳基腈氧化物的存在下未观察到较低的产率或没有反应。通过从头算三个反应的活化能可以证实这种行为。通过在酸性条件下将相应的5-羟基-2-异恶唑啉脱水/芳香化,定量获得了许多3-芳基-5-乙烯基异恶唑。据报道,侧链精细化是一些乙烯基异恶唑和乙烯基异恶唑啉的合成工具。 3-芳基-5-羟基-5-乙烯基-2-异恶唑啉是通过使芳基腈氧化物与甲基乙烯基酮(MVK)的烯醇锂在–78°C下反应合成的。在芳基部分上带有吸电子基团或体积较小的基团的芳基腈氧化物的情况下,可获得相当好的收率。相反,在受阻芳基腈