Chiral Phosphoric Acid Catalyzed Enantioselective [4+3]-Cyclization Reaction of Indol-4-ylmethanols and Quinone Esters
作者:Xufeng Lin、Zhouli Chen、Lei Wang、Yiheng Qian
DOI:10.1055/a-1522-9361
日期:2021.7
An asymmetric [4+3] cyclization reaction of racemic 4-indolylmethanols and quinone esters catalyzed by chiral phosphoric acids has been developed. This method provides efficient access to biologically important benzoxepino[5,4,3-cd] indoles featuring both axial and central chirality in good yields with up to 98% ee and essentially single diastereomer in mild reaction conditions.
4-indolylmethanol-involved reaction, which will advance the chemistry of indolylmethanols. A Brønstedacid catalyzed dehydrative arylation of 4-indolylmethanols with indoles has been established, leading to a series of indolyl-substituted triarylmethanes in good to excellent yields (up to 97% yield). In addition, in this Brønstedacid catalyzed dehydration process, the only byproduct was water. Accordingly, this