Enantioselective Friedel–Crafts alkylation of indoles with 2-enoylpyridine-N-oxides catalyzed by glucoBOX-Cu(ii) complex
作者:Jimil George、B. V. Subba Reddy
DOI:10.1039/c2ob25315a
日期:——
glucosamine derived glucoBOX-Cu(II) complex was found to be a unique catalytic system for enantioselectiveFriedel–Craftsalkylation of indoles with 2-enoylpyridine-1-oxides. A large number of 3-alkylated indole derivatives were prepared using 5 mol% glucoBOX-Cu(II) complex in excellent yields with high enantioselectivity up to 99% ee.
Enantioselective Michael Addition of Malonates to 2-Enoylpyridine <i>N</i>-Oxides Catalyzed by Chiral Bisoxazoline–Zn(II) Complex
作者:Sumit K. Ray、Pradeep K. Singh、Vinod K. Singh
DOI:10.1021/ol202405v
日期:2011.11.4
An enantioselective Michael addition of malonates to 2-enoylpyridine N-oxides catalyzed by a chiral bisoxazoline–Zn(II) complex has been developed. The corresponding Michael adducts have been obtained in high yields with up to 96% ee. A plausible transition-state model has been proposed to explain the stereochemical outcome of the reaction.