Silver-promoted Friedel–Crafts reaction: concise total synthesis of (−)-ardeemin, (−)-acetylardeemin and (−)-formylardeemin
作者:Y. Wang、C. Kong、Y. Du、H. Song、D. Zhang、Y. Qin
DOI:10.1039/c2ob00014h
日期:——
Total syntheses of multidrug resistant inhibitors (−)-acetylardeemin 2a, (−)-ardeemin 2b, and (−)-formylardeemin 3 have been achieved within 10 steps starting from bromopyrroloinoline 13. The key step involves direct alkylation of 13 with prenyl tributylstannane 11 to yield 12via a silver-promoted asymmetric Friedel–Crafts reaction. Highly efficient installation of the isoprenyl group allowed excellent
Acid-mediated aryl migration reaction of C-3 aryl substituted pyrrolidinoindolines
作者:Shinji Tadano、Hayato Ishikawa
DOI:10.1016/j.tetlet.2016.11.069
日期:2017.1
Aryl migration reactions of C-3 aryl substituted pyrrolidinoindoline compounds to provide highly conjugated C-2 aryl indole compounds have been discovered. The developed reactions have a wide substrate scope and proceed in high yield under simple acidic conditions. A unique cationic cyclopropane intermediate as the transition state is proposed.