Synthesis of Isoindole Derivatives by Palladium-Catalyzed Domino Reaction of (2-Alkynyl)phenylketone O-Pentafluorobenzoyloximes
作者:Mitsuru Kitamura、Yohei Moriyasu、Tatsuo Okauchi
DOI:10.1055/s-0030-1259556
日期:2011.3
Isoindole derivatives were synthesized by the palladium-catalyzed cyclization of (2-alkynyl)phenylketone O-pentafluorobenzoyloximes in the presence of organometallic compounds such as sodium formate and aryl boronic acid.
We report geometry-dependent cyclizations of o-alkynylaryl ketoximes and nitrones catalyzed by goldcomplexes. (E)-Ketoximes undergo N-attack to give isoquinoline-N-oxides. In sharp contrast, (Z)-ketoximes undergo unprecedented O-nucleophilic attack, followed by a redoxcascade leading to a novel catalytic entry to isoindoles of diverse scope. The structure of an isoindole was unambiguously supported
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