Photoinduced Tandem Reactions of Isoquinoline-1,3,4-trione with Alkynes To Build Aza-polycycles
作者:Haitao Yu、Jinbo Li、Zhuangfei Kou、Xuewen Du、Yi Wei、Hoong-Kun Fun、Jianhua Xu、Yan Zhang
DOI:10.1021/jo100218w
日期:2010.5.7
Photoinduced tandem reactions of isoquinoline-1,3,4-triones (3) with azaaryl substituted acetylenes (4a−4o) are described as an efficient method to build novel aza-polycycles. Most of the reactions proceeded via the tandem reaction sequence of photoinduced [2 + 2] cycloaddition (the Paterno−Büchi reaction)-oxetene electrocyclic ring opening-hexatriene to phenanthrene type electrocyclization-oxidative
异喹啉-1,3,4-三酮(3)与氮杂芳基取代的乙炔(4a - 4o)的光诱导串联反应被描述为构建新型氮杂多环化合物的有效方法。大多数反应是通过光诱导的[2 + 2]环加成反应(Paterno-Büchi反应)-氧杂环丁烯电环开环-己三烯至菲型电环化-氧化脱氢的串联反应顺序。使用异喹啉三酮与被吡啶,嘧啶,吡嗪和喹啉等不同氮杂芳基环取代的乙炔进行的这些光串联反应,我们能够获得各种杂多氮杂多环骨架,其中异喹啉二酮与萘,喹啉或异喹啉,喹唑啉,喹喔啉和苯并菲合,产率分别高达85%。讨论了[2 + 2]光环加成反应的区域选择性和反应顺序中导致形成不同的氮杂-多环系统的电环化反应。