Brønsted Acid‐Catalyzed Enantioselective Cycloisomerization of Arylalkynes
作者:Julien Gicquiaud、Baptiste Abadie、Kalyan Dhara、Murielle Berlande、Philippe Hermange、Jean‐Marc Sotiropoulos、Patrick Y. Toullec
DOI:10.1002/chem.202003783
日期:2020.12.9
alkyne‐containing substrate catalyzed by chiral Brønsted acids was achieved. The use of the 2‐hydroxynaphthyl substituent on the alkyne as a directing group constituted the key parameter enabling both efficient regioselective protonation of the carbon–carbon triple bond and chiral induction. The key cationic intermediate could be depicted either as a cationic vinylidene ortho‐quinonemethide or a stabilized vinyl