A convenient protocol for the efficient synthesis of aryloxycoumarins and (aryloxyimino)ethylcoumarins is described. The synthetic route developed involves the Cu-promoted CO and NO coupling reactions from readily available hydroxycoumarin and (hydroxyimino)ethylcoumarin derivatives in the presence of the catalytic system Cu(OAc) 2 /Et 3 N. By applying this condition, a series of arylboronic acids have been successfully reacted to afford the coupled products in fair ...
