A mild and inexpensive Ti(O i -Pr) 4 -mediated aminolysis of 2,3-epoxy amides has been developed. The reaction proceeds with excellent regioselectivity, regardless of the steric hindrance of the substituents on the heterocyclic ring, providing vicinal amino alcohols that are very suitable for synthetic applications.
已开发出温和且廉价的 Ti(O i -Pr) 4 介导的 2,3-环氧酰胺氨解。该反应以优异的区域选择性进行,与杂环上取代基的空间位阻无关,提供了非常适合合成应用的邻氨基醇。
New chiral amino alcohol ligands for catalytic enantioselective addition of diethylzincs to aldehydes
applicability as chiralcatalysts was evaluated by carrying out the same reaction on a family of aldehydes, including variously substituted aromatic ones as well as an aliphatic analogue. The results have confirmed the validity of the fine-tuning process performed on ligands 13a and 13b. In fact, both exhibited excellent catalytic activity as demonstrated by the chemical yields and ee obtainedfrom all the