Bifunctional Guanidine via an Amino Amide Skeleton for Asymmetric Michael Reactions of β-Ketoesters with Nitroolefins: A Concise Synthesis of Bicyclic β-Amino Acids
作者:Zhipeng Yu、Xiaohua Liu、Lin Zhou、Lili Lin、Xiaoming Feng
DOI:10.1002/anie.200901337
日期:2009.6.29
Two activations are better than one: The chiral bifunctional guanidine 1, which features an amino amide backbone, catalyzes the asymmetric Michael addition of a range of substrates and gives products with excellent stereoselectivities. The method also allows the efficient synthesis of optically pure β‐amino acid esters. Both the guanidine group and the NH proton of the amide were important for the
两种活化优于一种:氨基氨基骨架的手性双官能胍1催化一系列底物的不对称迈克尔加成反应,并提供具有出色立体选择性的产物。该方法还可以有效合成光学纯的β-氨基酸酯。胍基和酰胺的NH质子均对双重活化很重要。