Synthesis of Optically Pure Arylsilylcarbinols and Their Use as Chiral Auxiliaries in Oxacarbenium Ion Reactions
作者:John R. Huckins、Scott D. Rychnovsky
DOI:10.1021/jo035260o
日期:2003.12.1
as chiral auxiliaries for oxacarbenium ion reactions. The optically pure arylsilylcarbinols were prepared using Noyori's transfer hydrogenation catalyst 11. The transfer hydrogenation shows very good enantioselectivities and turnover efficiency for the aryl silyl ketones and is the method of choice for preparing these optically pure alcohols. The diastereoselective addition of allyltrimethylsilane to
We report here the first example of the reduction of acylsilanes to alpha-hydroxysilanes, in which diethylzinc was used as a highly reactive agent in the presence of Ti(OiPr)(4) or other Lewis acids. The reduction typically proceeds to give synthetically useful alpha-hydroxysilanes in good yields. (c) 2012 Elsevier Ltd. All rights reserved.
Asymmetric Hydrogenation of Aromatic, Aliphatic, and α,β-Unsaturated Acyl Silanes Catalyzed by Tol-binap/Pica Ruthenium(II) Complexes: Practical Synthesis of Optically Active α-Hydroxysilanes