Silver(I)-Catalyzed Direct Route to Isoquinoline-<i>N</i>-Oxides
作者:Seunghoon Shin、Hyun-Suk Yeom、Sunghwan Kim
DOI:10.1055/s-2008-1042936
日期:2008.4
Silver trifluoromethanesulfonate efficiently catalyzes the cyclization of 2-alkynylbenzaldoxime derivatives into the corresponding isoquinoline- N-oxides. The current protocol provides a direct route to the latter skeleton under a very mild reaction condition.
A highly efficient method for the facile access of isoquinolines and isoquinoline N-oxides via a Cu(i)-catalyzed intramolecular cyclization of (E)-2-alkynylaryl oxime derivatives in water has been developed. This protocol was performed under simple and mild conditions without organic solvent, additives or ligands. By switching on/off a hydroxyl protecting group of oximes, the selective N-O/O-H cleavage