Enantioselective addition of diethylzinc to aldehydes using immobilized chiral BINOL-Ti complex on ordered mesoporous silicas

被引：39
|
作者：
Pathak, Kavita [1 ]
Bhatt, Achyut P. [1 ]
Abdi, Sayed H. R. [1 ]
Kureshy, Rukhsana I. [1 ]
Khan, Noor-ul H. [1 ]
Ahmad, Irshad [1 ]
Jasra, Raksh V. [1 ]
机构：
[1] Cent Salt & Marine Chem Res Inst, Silicates & Catalysis Discipline, Bhavnagar 364002, Gujarat, India
来源：
TETRAHEDRON-ASYMMETRY | 2006年 / 17卷 / 10期
关键词：
D O I：
10.1016/j.tetasy.2006.05.017
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A chiral (S)-BINOL ligand has been covalently grafted on ordered mesoporous silicas-MCM-41 and SBA-15 and the resulting inorganic-organic hybrid materials used as chiral auxiliaries in Ti-promoted enantio selective addition of diethyl zinc to aldehydes under heterogeneous conditions. These heterogeneous catalysts showed promising activity and enantioselectivity. The catalyst having a larger pore diameter with capping of free silanol moiety with trimethylsilyl (TMS) group was found to be more active with enantio-selectivities up to 81% being achieved. The catalyst worked well up to three cycles with retention of enantioselectivity after washing with 10% HCl in methanol. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1506 / 1513
页数：8
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