Asymmetric Synthesis of α-Amino Acids by Reduction of N-tert-Butanesulfinyl Ketimine Esters
摘要:
A highly regio- and diastereoselective reduction of various N-tert-butanesulfinyl ketimine esters with L-Selectride resulting in the formation of alpha-amino acids is reported. This method is quite general and also practical for the preparation of both enantiomers of aryl or aliphatic a-amino acids in high yields.
Diastereoselective Hydrosilylation of <i>N</i>
-(<i>tert</i>
-Butylsulfinyl)imines Catalyzed by Zinc Acetate
作者:Anna Adamkiewicz、Jacek Mlynarski
DOI:10.1002/ejoc.201501318
日期:2016.2
An efficient zinc-catalyzed diastereoselective hydrosilylation of N-(tert-butylsulfinyl)imines has been developed that does not require the use of ligands or noble metals. A variety of N-(tert-butylsulfinyl)imines were reduced by this protocol in the presence of a catalytic amount of zinc acetate (5 mol-%) to provide the corresponding secondary amines in high yields with excellent diastereoselectivities
已经开发出一种高效的锌催化非对映选择性氢化硅烷化 N-(叔丁基亚磺酰基)亚胺,不需要使用配体或贵金属。在催化量的乙酸锌 (5 mol-%) 存在下,通过该方案还原了各种 N-(叔丁基亚磺酰基)亚胺,以高产率提供相应的仲胺,并具有出色的非对映选择性(高达 98 % de )。通过使用三乙氧基硅烷作为有效的氢源,这种实验上简单的催化过程很容易适用于芳族和脂肪族胺的合成。