Total synthesis of valeriananoids A, B, and C via autocatalytic diastereoselective domino Michael reaction
作者:Masakazu Fukushima、Akihiro Morii、Takashi Hoshi、Toshio Suzuki、Hisahiro Hagiwara
DOI:10.1016/j.tet.2007.04.095
日期:2007.7
unique tricyclic sesquiterpenoids, valeriananoids A–C 1–3, have been synthesized starting from bicyclo[2.2.2]octane-2,5-dione derivative 11, which was obtained by diastereoselective catalytic domino Michael reaction of oxophorone 5 with 8-phenylmenthyl acrylate 10 by LDA or silica-gel-base (NMAP-Li). The tricyclic ring was closed selectively by intramolecular 6-endo-trig mode cyclization of the ketyl radical
的独特三环倍半萜天然的对映体,valeriananoids A-C 1 - 3,已经合成从双环[2.2.2]辛烷-2,5-二酮衍生物开始11,这是由非对映选择性催化多米诺迈克尔反应得到的oxophorone 5与8 LDA或硅胶基质(NMAP-Li)制成的丙烯酸-苯基薄荷酯10。三环通过酮基的分子内6-内-触发模式环化而选择性地封闭,所述酮基是由酮-烯丙基醚25通过萘或萘二甲酸钠生成的。