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.
N-Heterocyclic carbene-catalyzed diastereoselective synthesis of β-lactone-fused cyclopentanes using homoenolate annulation reaction
作者:Subrata Mukherjee、Santigopal Mondal、Atanu Patra、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1039/c5cc02960k
日期:——
NHC-catalyzed annulation of enals with 2-enoylpyridines or 2-enoylpyridine N-oxides leading to the diastereoselective synthesis of [small beta]-lactone-fused cyclopentanes is reported. The reaction proceeds via the generation of homoenolate equivalent intermediates and...
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
A novel chiral surfactant-type metallomicellar catalyst for asymmetric Michael addition in water
作者:Xinping Liang、Yang Gui、Kuiliang Li、Jindong Li、Zhenggen Zha、Lei Shi、Zhiyong Wang
DOI:10.1039/d0cc04410e
日期:——
amines and lipophilic groups were designed and synthesized. Using these ligands, a new chiral surfactant-type metallomicellar catalyst was developed in water, and this was identified by SEM/TEM analyses. These metallomicelles can be empolyed in asymmetricMichaeladditionreactions in water, delivering the corresponding adducts with excellent yields and enantioselectivities.
Chiral bipyridine-annulated bicyclo[3.3.1]nonane N-oxide organocatalysts for stereoselective allylation and hydrosilylation reactions
作者:Simona Žeimytė、Sigitas Stončius
DOI:10.1016/j.tet.2020.131831
日期:2021.1
The synthesis of chiral C2-symmetric bis(bipyridine N,N′-dioxide) and bis(bipyridine N-monooxide) derivatives featuring bipyridine-annulated bicyclo[3.3.1]nonane framework is reported. The new Lewis basic bipyridine N,N′-dioxides exhibited good catalytic activity in the asymmetric allylation of aldehydes with allyltrichlorosilane, furnishing corresponding homoallylic alcohols in up to 75% ee. Reduction