Catalytic Enantio- and Diastereoselective Formation of β-Sultones: Ring-Strained Precursors for Enantioenriched β-Hydroxysulfonyl Derivatives
作者:Florian M. Koch、René Peters
DOI:10.1002/anie.200604796
日期:2007.4.2
Lewis Acid/Base Catalyzed [2+2]‐Cycloaddition of Sulfenes and Aldehydes: A Versatile Entry to Chiral Sulfonyl and Sulfinyl Derivatives
作者:Florian M. Koch、René Peters
DOI:10.1002/chem.201003542
日期:2011.3.21
application of sulfene intermediates in asymmetric catalysis. The reactivity of a sulfene normally acting as an electrophile could be reverted by the formation of a nucleophilic zwitterionic sulfene–amine adduct. To achieve a combination of high enantioselectivity and reactivity, cooperative catalytic action of a chiral nucleophilic tertiary amine (the cinchona alkaloid derivative diydroquinine 2,5‐diphenyl‐4