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.
Highly Enantio- and Diastereoselective Inverse Electron Demand Hetero-Diels-Alder Reaction using 2-Alkenoylpyridine N-Oxides as Oxo-Heterodienes
作者:Santiago Barroso、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/adsc.200800606
日期:2009.1
A general catalytic inverseelectrondemand hetero-Diels Alder reaction for 2-alkenoylpyridineN-oxides is presented. 2-AlkenoylpyridineN-oxides react very efficiently with alkenes in the presence of bisoxazolidine-copper(II) [BOX-Cu(II)] complexes to give chiral dihydropyrans bearing a pyridine ring at the 6-position with very high yields and excellent diastereo- and enantioselectivity. These heterodienes
Enantioselective Mukaiyama-Michael Reaction of Silyl Enol Ethers to 2-Enoylpyridine<i>N</i>-Oxides Catalyzed by Copper- Bis(oxazoline) Complex
作者:Jimil George、Basi V. Subba Reddy
DOI:10.1002/adsc.201200631
日期:2013.1.16
A catalytic enantioselectiveMukaiyama–Michaelreaction of 2-enoylpyridine N-oxides has been developed using a simple bis(oxazoline)-copper complex. A variety of silylenolethers undergo smooth Michael addition with 2-enoylpyridine N-oxides to furnish the corresponding Michael adducts in high yields with high enantioselectivities (up to 97% ee).
Highly Enantioselective Friedel−Crafts Reaction of Indoles with 2-EnoylPyridine 1-Oxides Catalyzed by Chiral Pyridine 2,6-Bis(5′,5′-diphenyloxazoline)−Cu(II) Complexes
作者:Pradeep K. Singh、Vinod K. Singh
DOI:10.1021/ol8016929
日期:2008.9.18
The catalytic enantioselective Friedel-Crafts reaction of indoles with 2-enoylpyridine 1-oxides has been studied in the presence of chiral pyridine 2,6-bis(5',5'-diphenyloxazoline)-Cu(II) complexes. The reaction furnished alkylated indoles in excellent yields (up to 97%) and enantioselectivities (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.