Enantioselective synthesis of fluorene derivatives by chiral N-triflyl phosphoramide catalyzed double Friedel–Crafts alkylation reaction
作者:Shou-Guo Wang、Long Han、Mi Zeng、Feng-Lai Sun、Wei Zhang、Shu-Li You
DOI:10.1039/c2ob07168a
日期:——
highly efficient tandem double Friedel–Craftsreaction between indoles and 2-formylbiphenyl derivatives by chiral N-triflyl phosphoramide was realized. Under mild conditions, various 9-(3-indolyl) fluorenederivatives have been obtained in good yield and up to 94% ee. Comparing to their corresponding chiral phosphoric acids, chiral N-triflyl phosphoramides catalyzed reactions led to products with opposite
Enantioselective Synthesis of Fluorene Derivatives by Chiral Phosphoric Acid Catalyzed Tandem Double Friedel-Crafts Reaction
作者:Feng-Lai Sun、Mi Zeng、Qing Gu、Shu-Li You
DOI:10.1002/chem.200901369
日期:2009.9.7
Squeeze out the water! Chiral phosphoric acid catalyzed tandem double Friedel–Craftsreactions between indoles and 2‐formylbiphenyls were realized under mild conditions. The 9‐(3‐indolyl)fluorenederivatives were obtained in good yields and up to 96 % ee, leaving water as the sole by‐product (see scheme).