A Nitro Sugar-Mediated Stereocontrolled Synthesis of β2-Amino Acids: Synthesis of a Polyhydroxylated trans-2-Aminocyclohexanecarboxylic Acid
作者:José M. Otero、Fernando Fernández、Juan C. Estévez、Robert Nash、Ramón J. Estévez
DOI:10.1002/ejoc.201200103
日期:2012.5
The first stereocontrolled nitro sugar-mediated synthesis of polyhydroxylated β-amino acids and their incorporation into peptides is described. The key steps of this approach are a Michael addition of the lithium salt of tris(phenylthio)methane (a carboxyl synthetic equivalent) to sugar nitro olefins, and the reduction of the nitro group to an amino group. Specifically, two glyceraldehyde-based β-amino
描述了第一个立体控制的硝基糖介导的多羟基化 β-氨基酸合成及其与肽的结合。这种方法的关键步骤是将三(苯硫基)甲烷(一种羧基合成等价物)的锂盐与糖硝基烯烃进行迈克尔加成,并将硝基还原为氨基。具体而言,制备了两种基于甘油醛的β-氨基酸和一种多羟基化环己基β-氨基酸。后者可以作为脯氨酸-甘氨酸 δ-转角的水溶性模拟物,很容易转化为相应的 5-氨基-6-(羟甲基)环己烷-1,2,3,4-四醇,这是一种新型的氨基糖。然而,这没有显示出显着的糖苷酶抑制特性。