Synthesis of Erythrina and Related Alkaloids Part XLIV. Total Synthesis of Homoerythrinan Alkaloids, Schelhammericine and 3-Epischelhammericine.
作者:Yoshisuke TSUDA、Takeshi OHSHIMA、Shinzo HOSOI、Satomi KANEUCHI、Fumiyuki KIUCHI、Jun TODA、Takehiro SANO
DOI:10.1248/cpb.44.500
日期:——
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TBAF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。