Domino Pd‐Catalyzed Heck Cyclization and Bismuth‐Catalyzed Hydroamination: Formal Synthesis of Elacomine and Isoelacomine
作者:Haruhi Kamisaki、Takeshi Nanjo、Chihiro Tsukano、Yoshiji Takemoto
DOI:10.1002/chem.201002287
日期:2011.1.10
The formal synthesis of hemiterpene spirooxindole alkaloids elacomine (1) and isoelacomine (2) is described. Heck reaction of protected iodoanilines with 5,6‐dihydro‐2H‐pyran‐2‐one or six‐membered unsaturated lactams was investigated. The coupling product was readily converted to a carbamoyl chloride with an incorporated diene unit. The spiro(pyrrolidine‐3,3′‐oxindole) skeleton, which corresponds to
描述了半萜烯螺环吲哚生物碱可可碱(1)和异可可碱(2)的形式合成。研究了受保护的碘代苯胺与5,6-二氢-2 H-吡喃-2-或一元或六元不饱和内酰胺的Heck反应。偶合产物很容易转化为带有并入二烯单元的氨基甲酰氯。通过多米诺骨牌钯催化的Heck反应和铋催化的加氢胺化反应,可以高效地构建螺环(吡咯烷3,3'-羟吲哚)骨架,该骨架对应于1和2的碳骨架。反应的分离的副产物也可以转化为螺并恶吲哚骨架。