Intramolecular Cycloaddition in Cyclohexa-2,4-dienone and Photochemical Reactions: An Efficient Route to Azatriquinane and Azasterpurane Frameworks
作者:Vishwakarma Singh、Bharat Sahu、Shaikh Mobin
DOI:10.1055/s-2008-1072588
日期:2008.5
A novel, efficient and stereoselective entry to azatriquinane and azasterpurane frameworks from simple aromatic precursor, is described. The methodology involves in situ generation of cyclohexa-2,4-dienones containing a tether and intramolecular π4s+π2s cycloaddition that leads to a bicyclo[2.2.2]octenone-annulated five-membered ring that contains nitrogen. Further manipulation of the resulting adduct
描述了一种从简单的芳香族前体进入氮杂三喹烷和氮杂嘌呤骨架的新型、有效和立体选择性的入口。该方法涉及原位生成包含系链和分子内 π4s+π2s 环加成的环己-2,4-二烯酮,该环加成导致双环 [2.2.2] 辛烯酮成环的五元环含有氮。对所得加合物的进一步操作,随后进行光化学 sigmatropic 位移,很容易提供氮杂三喹烷和氮杂紫杉烷骨架。