Total syntheses of two homerythrinan alkaloids, schelhammericine and 3-epischelhammericine, are described. Photocycloaddition of a dioxopyrrolobenzazepine to 1-methoxy-3-trimethylsilyloxybutadiene afforded, in a regio- and stereo-specific manner, the cyclobutane derivative, which was converted to a homoerythrinan derivative by utilizing a TBAF-induced 1, 3-anionic rearrangement. The product was transformed into the title alkaloids in several steps.
描述了两种同红藻碱(homerythrinan alkaloids),即施尔哈默碱(schelhammericine)和3-去施尔哈默碱(3-epischelhammericine)的总合成。将一个二
氧基
吡咯苯并
氮烯(dioxopyrrolobenzazepine)与1-甲
氧基-3-三
甲基硅氧基
丁二烯进行光环加成,得到了线性和立体特异性的
环丁烷衍
生物,该衍
生物通过利用T
BAF诱导的1,3-阴离子重排转化为同红藻衍
生物。最终产物在几步反应中转化为目标碱类。