1.
Beilstein J Org Chem
; 9: 180-4, 2013.
Artigo
em Inglês
| MEDLINE
| ID: mdl-23400373
RESUMO
Cu-catalyzed A(3) coupling of ethoxyacetylene, pyrrolidine and salicylaldehydes led to a concomitant cycloisomerization followed by hydrolysis of the resultant vinyl ether to afford coumarins in a cascade process. The reaction proceeded through exclusive 6-endo-dig cyclization and is compatible with halo and keto groups giving coumarins in good to moderate yields.