Coupling Radical Homoallylic Expansions with C–C Fragmentations for the Synthesis of Heteroaromatics: Quinolines from Reactions of <i>o</i>-Alkenylarylisonitriles with Aryl, Alkyl, and Perfluoroalkyl Radicals
作者:Christopher J. Evoniuk、Gabriel dos Passos Gomes、Michelle Ly、Frankie D. White、Igor V. Alabugin
DOI:10.1021/acs.joc.7b00262
日期:2017.4.21
radicals to isonitriles can be harnessed for initiating reaction cascades designed to overcome the stereoelectronic restrictions on homoallylic ring expansion in alkyne reactions and to develop a new general route for the preparation of N-heteroaromatics. This method utilizes alkenes as synthetic equivalents of alkynes by coupling homoallylic ring expansion to yield the formal “6-endo” products with aromatization
可以利用自由基向异腈中的选择性加成来引发反应级联反应,该反应级联旨在克服炔烃反应中立体电子对均烯丙基环扩展的限制,并为制备N-杂芳族化合物开发一条新的通用路线。该方法利用烯烃作为炔烃的合成等价物,通过均电子扩环偶联,通过立体电子辅助的C-C键断裂产生芳构化的形式正式的“ 6- endo ”产品。均质膨胀势能面的计算分析表明,间接5-exo / 3-exo / retro-3-exo路径比直接6-endo-trig封闭更快,从而揭示了环化过程的一般exo-preference。