A Novel Synthesis of Bicyclic Isoxazolines<i>via</i>Sequential Michael and Intramolecular 1,3-Dipolar Additions
作者:Hidemitsu Uno、Noriko Watanabe、Satomi Fujiki、Hitomi Suzuki
DOI:10.1055/s-1987-27973
日期:——
Bicyclic isoxazolines are obtained in good yields by the titanium tetrachloride-mediated reaction of allylic stannanes with 1-nitroalkadienes. Titanium tetrachloride converts stannyl nitronates generated in the Michael addition step to nitrile oxide equivalents which, on adding triethylamine, undergo intramolecular 1,3-dipolar cycloaddition to give the isoxazolines.
通过四氯化钛介导的烯丙基锡烷与 1-硝基烷二烯的反应,可以以良好的收率获得双环异噁唑啉。四氯化钛将迈克尔加成步骤中生成的锡基硝酸酯转化成腈氧化物等价物,这些等价物在加入三乙胺后发生分子内 1,3-二极环加成反应,生成异噁唑类化合物。