Direct Asymmetric Aldol Reaction of Aryl Ketones with Aryl Aldehydes Catalyzed by Chiral BINOL-Derived Zincate Catalyst
作者:Hong Li、Chao-Shan Da、Yu-Hua Xiao、Xiao Li、Ya-Ning Su
DOI:10.1021/jo801182n
日期:2008.9.19
Directasymmetricaldol reaction of aryl ketones with aryl aldehydes catalyzed by chiral metal complex is reported for the first time herein. Two novel semicrown chiral ligands 1a and 1b were synthesized from (S)- and (R)-BINOL, respectively, and then employed to catalyze the directasymmetricaldol addition of aryl ketones to aryl aldehydes. Introduced with 2.0 equiv of diethylzinc, 1b had higher
Direct asymmetric aldol reaction of acetophenones with aromatic aldehydes catalyzed by chiral Al/Zn heterobimetallic compounds
作者:Xiao Li、Lei Zhang、Yu-Hua Xiao、Qi-Peng Guo、Chao-Shan Da、Hong Li、Xiaoju Liu、Xiangrong Ma、Yajun Ma
DOI:10.1134/s1070363216080247
日期:2016.8
Chiral Al/Zn heterobimetallic complexes are effective catalysts for the direct highly enantioselective aldol reaction of acetophenones with aromatic aldehydes. The Al site in the complex acts as a Lewis acid to activate aldehyde, whereas ethylzinc alkoxide plays a role of a Brønsted base to form a reactive zinc enolate with acetophenone. Distinct nature of two different metals contributes to the efficient
A (S)-pyrrolidine sulfonamidecatalyzed asymmetric direct aldol reaction of aryl methyl ketones with aromatic aldehydes has been developed with moderate to good enantioselectivities. The study considerably broadens the substrate scope of chiral amines promoted aldol processes.
Investigations of enantioreversal in both direct and directed enantioselective aldol reactions catalyzed by CuCl2[(−)-sparteine] and NiCl2[(−)-sparteine] complexes
作者:H. Maheswaran、P.J. Amal Joseph、K. Leon Prasanth、S. Priyadarshini、P. Satyanarayana、Praveen R. Likhar、M. Lakshmi Kantam
DOI:10.1016/j.tetasy.2010.07.008
日期:2010.9
chiral [CuCl2(sparteine)] 1 and [NiCl2(sparteine)] 2 complexes as catalysts under fluoride anion-promoted double catalytic activation (DCA) conditions cause enantioreversal in the asymmetric Mukaiyama aldol reaction of 1-phenyl-1-trimethylsiloxyethylene with various aromatic aldehydes. A similar enantioreversal also occurs in the direct aldol reaction between methyl vinyl ketone and various aromatic aldehydes
One-pot bienzymatic cascade combining decarboxylative aldol reaction and kinetic resolution to synthesize chiral β-hydroxy ketone derivatives
作者:Fan Xu、Jian Xu、Yujing Hu、Xianfu Lin、Qi Wu
DOI:10.1039/c6ra12729k
日期:——
bienzymatic one-potsequential cascade for the synthesis of (S)-β-hydroxy ketones and acylated (R)-β-hydroxy ketone derivatives was successfully developed. An immobilized lipase from Mucor miehei (MML) catalysed promiscuous decarboxylative aldol reaction and a lipase A or B from Candida antarctica (CAL-A or CAL-B) catalysed kinetic resolution of racemic β-hydroxy ketone were combined in this one-pot protocol