Tripeptides of the Type H-D-Pro-Pro-Xaa-NH<sub>2</sub>as Catalysts for Asymmetric 1,4-Addition Reactions: Structural Requirements for High Catalytic Efficiency
作者:Markus Wiesner、Markus Neuburger、Helma Wennemers
DOI:10.1002/chem.200901021
日期:2009.10.5
functional requirements within the asymmetric peptidic catalyst H‐D‐Pro‐Pro‐Asp‐NH2 led to the development of the closely related peptide H‐D‐Pro‐Pro‐Glu‐NH2 as an even more efficient catalyst for asymmetric conjugate addition reactions of aldehydes to nitroolefins. In the presence of as little as 1 mol % of H‐D‐Pro‐Pro‐Glu‐NH2, a broad range of aldehydes and nitroolefins react readily with each other. The resulting
对不对称肽催化剂H ‐ D ‐Pro‐Pro‐Asp‐NH 2的结构和功能要求的分析导致紧密相关的多肽H ‐ D ‐Pro‐Pro‐Glu‐NH 2的开发醛与硝基烯烃不对称共轭加成反应的催化剂。在低至1 mol%的H ‐ D ‐Pro‐Pro‐Glu‐NH 2存在下,各种各样的醛和硝基烯烃容易相互反应。所得的γ-硝基醛在室温下以优异的收率和立体选择性获得。在肽催化剂的结构内,D‐Pro‐Pro母题是导致高立体选择性的主要因素。C末端酰胺和C末端氨基酸侧链中羧酸的间隔基负责立体选择性的微调。肽催化剂不仅可以在温和的条件下实现高效的不对称催化,而且还可以在没有添加剂的情况下发挥作用。