Solution-Phase Parallel Synthesis of a Pharmacophore Library of HUN-7293 Analogues: A General Chemical Mutagenesis Approach To Defining Structure−Function Properties of Naturally Occurring Cyclic (Depsi)peptides
作者:Yan Chen、Melitta Bilban、Carolyn A. Foster、Dale L. Boger
DOI:10.1021/ja020166v
日期:2002.5.1
are detailed enlisting solution-phase techniques and simple acid-base liquid-liquid extractions for isolation and purification of intermediates and final products. Significant to the design of the studies and unique to solution-phase techniques, the library was assembled superimposing a divergent synthetic strategy onto a convergent total synthesis. An alanine scan and N-methyl deletion of each residue
作者:Dale L. Boger、Holger Keim、Berndt Oberhauser、Erwin P. Schreiner、Carolyn A. Foster
DOI:10.1021/ja990918u
日期:1999.7.1
the DGCN α-center permitting the utilization of a readily available l-amino acid precursor to the d α-hydroxy carboxylicacid residue. An alternative and similarly attractive approach of direct macrolactonization of a substrate necessarily incorporating a d-DGCN subunit proved viable albeit less effective. Biological evaluation in cellular assays for vascular adhesion molecule expression confirmed that
详细介绍了环状七肽 HUN-7293 (1) 的首次全合成,这是一种具有抗炎特性的细胞粘附分子表达的强效抑制剂。最有效的方法依赖于异常有效的大环化,形成 MLEU3-LEU4 仲酰胺,这可能受益于无环底物的分子内 H 键预组织。必需的线性缩酚肽与后期引入的连接酯聚合组装,该酯化作用发生在 DGCN α-中心的反转中,允许利用容易获得的 l-氨基酸前体生成 d α-羟基羧酸残留物。一种替代且类似有吸引力的直接大环内酯化方法,必须结合 d-DGCN 亚基,证明是可行的,尽管效果较差。血管粘附分子表达的细胞测定中的生物学评估证实合成 HUN-7923 (1...