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Cinchona Alkaloid Catalyzed Enantioselective Chlorination of 3-Aryloxindoles

✍ Scribed by Mei-Xin Zhao; Zhi-Wang Zhang; Ming-Xiao Chen; Wen-Hao Tang; Min Shi

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
281 KB
Volume
2011
Category
Article
ISSN
1434-193X

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Highly Enantioselective Michael Addition
Highly Enantioselective Michael Addition of 3-Aryloxindoles to Phenyl Vinyl Sulfone Catalyzed by Cinchona Alkaloid-Derived Bifunctional Amine–Thiourea Catalysts Bearing Sulfonamide as Multiple Hydrogen-Bonding Donors
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## Abstract A highly enantioselective Michael addition of 3‐aryloxindole to phenyl vinyl sulfone catalyzed by a quinine‐derived bifunctional amine–thiourea‐bearing sulfonamide as multiple hydrogen‐bonding donor catalyst has been investigated. The corresponding adducts, which contain a chiral quater

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Enantioselective Dihydroxylation of Alkenes Catalyzed by a PEG-Bound Bi-Cinchona Alkaloid Ligand
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## Abstract The recyclable PEG‐bound bi‐cinchona alkaloid ligand has been successfully applied to the homogeneous catalytic asymmetric dihydroxylation of various alkenes; good yields and excellent enantioselectivities were obtained. The ligand could be easily recovered and reused for 10 times witho