Fengxia Han

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A magnesium-catalyzed asymmetric ring-opening reaction of aziridine with indole has been realized by employing commercially available chiral ligands. Both of the enantiomers of the ring-opening product could be obtained with good yields and a high level of enantioselectivity. The corresponding ring-opening product could be further transformed to various(More)
The first stereocontrolled cross reaction of enones has been realized. A novel combinational magnesium catalyst was designed to address the enantioselectivity problem between reaction partners with an intermolecular symmetric structure and bearing identical functional groups. This new catalytic strategy was proven to be effective to introduce high levels of(More)
Cooperative catalysis is emerging as a valuable tool in asymmetric synthesis, fuelled by the identification of more efficient catalytic systems with increased substrate scopes. Many endeavors have been devoted during the past few years toward developing the right catalyst pairs giving rise to powerful bifunctional systems, and many types of organic(More)
A direct, facile, and highly diastereo- and enantioselective dearomatization reaction of β-naphthol derivatives with aziridines has been developed for the first time. A newly designed Box-OH ligand was employed for an in situ generated magnesium catalyst and proved to be efficient. The corresponding dearomatization product was transformed into a polycyclic(More)
An asymmetric formal [3 + 2]-cycloaddition between meso-aziridines and C3-alkylindoles mediated by an in situ generated magnesium catalyst was developed for asymmetric construction of pyrroloindolines. A variety of pyrroloindolines could be obtained by employing commercial available ligands with the assistance of an easily prepared achiral ligand.
The successful application of imidazole-modified ketones in asymmetric anti-selective Michael reactions with trans-β-nitroalkenes is presented by employing a newly developed 3-bromothiophene-modified chiral diamine ligand. The corresponding conjugate adduct was submitted to further transformations with Grignard reagents to solve the problem of α-site(More)
The asymmetric Michael reaction between 5H-oxazol-4-ones and α,β-unsaturated acyl imidazoles is reported. A novel 2-benzo[b]thiophenyl-modified chiral ProPhenol species is synthesized and used as a ligand, leading to good enantioselectivities in this asymmetric conjugate addition reaction. Furthermore, the introduction of phenol additives as achiral(More)
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