Asymmetric addition of diethylzinc to benzaldehyde catalyzed by novel chiral C2-symmetric tetrakis(sulfonamide)–titanium(IV) complexes
摘要:
A series of chiral C-2-symmetric tetrakis(sulfonamides) 3a-f, 4a-f were prepared and employed as ligands for titanium(IV) complexes in the asymmetric addition of diethylzinc to benzaldehyde. The chiral secondary alcohols were obtained in high yields and in moderate enantioselectivities. (C) 2010 Elsevier Ltd. All rights reserved.
Monoimines derived from (1<i>R</i>,2<i>R</i>)-1,2-diaminocyclohexane in aza-Diels-Alder reaction: Synthesis and characterization of sulfur derivatives based on the 2-azanorbornyl skeleton
GRAPHICAL ABSTRACT ABSTRACT Enantiomericallypure bicyclic derivatives of 2-azanorbornane containing sulfonamide, amide, and thiourea functionalities were synthesized using aza-Diels-Alder reaction.
A series of chiral C-2-symmetric tetrakis(sulfonamides) 3a-f, 4a-f were prepared and employed as ligands for titanium(IV) complexes in the asymmetric addition of diethylzinc to benzaldehyde. The chiral secondary alcohols were obtained in high yields and in moderate enantioselectivities. (C) 2010 Elsevier Ltd. All rights reserved.