Gold-Catalyzed Sequential Activation of Propargylic Carboxylates: A Facile Route to Benzoannulenes
作者:Chang Ho Oh、Ji Hee Kim、Bu Keun Oh、Jong Ryul Park、Ji Ho Lee
DOI:10.1002/chem.201204091
日期:2013.2.18
A cascade reaction of 1‐(2‐(3‐acetoxyprop‐1‐ynyl)phenyl)prop‐2‐ynyl acetate and its derivatives is catalyzed by gold to give the corresponding benzo[7]annulenes (see scheme) in excellent yields. A double activation of the gold catalyst toward two different propargylic carboxylates was proposed. Benzoannulenes were hydrolyzed to 8‐hydroxybenzo[7]annulene‐5‐ones.