Remarkable Differences in Reactivity between Benzothiazoline and Hantzsch Ester as a Hydrogen Donor in Chiral Phosphoric Acid Catalyzed Asymmetric Reductive Amination of Ketones
作者:Kyung-Hee Kim、Takahiko Akiyama、Cheol-Hong Cheon
DOI:10.1002/asia.201501020
日期:2016.1
as hydrogen donors in the chiral phosphoric acid catalyzed asymmetric reductive amination of ketones with p‐anisidine. The asymmetric reductive amination of ketones with a Hantzsch ester as a hydrogen donor provided the corresponding chiral amines exclusively, regardless of the structures of the ketones, whereas a similar transformation with a benzothiazoline provided chiral amines and p‐methoxyphenyl‐protected
本文描述的是Hantzsch酯和苯并噻唑啉作为氢供体在手性磷酸催化酮与对茴香胺的不对称还原胺化反应中的行为差异。用Hantzsch酯作为氢供体进行酮的不对称还原胺化反应,仅提供了相应的手性胺,而与酮的结构无关,而用苯并噻唑啉进行的类似转化提供了手性胺和对甲氧基苯基保护的伯胺,收率各不相同。取决于酮和苯并噻唑啉的结构。因为苯并噻唑啉的N,S-乙缩醛部分易受p-茴香胺,伯胺可以通过苯并噻唑啉与对-茴香胺的氨基转移而形成,然后用剩余的苯并噻唑啉还原生成的亚胺。