Unequivocal Synthesis of (Z)-Alkene and (E)-Fluoroalkene Dipeptide Isosteres To Probe Structural Requirements of the Peptide Transporter PEPT1
摘要:
Described is a novel synthetic route for dipeptide isosteres containing (Z)-alkene and (E)-fluoroalkene units as cis-amide bond equivalents via organocopper-mediated reduction of gamma-acetoxy- or gamma,gamma-difluoro-alpha,beta-unsaturated-delta-lactams. The synthesized isosteres were evaluated in terms of their affinities for the peptide transporter PEPT1. traps-Amide isosteres tended to possess higher affinities for PEPT1 as compared to the corresponding cis-amide bond equivalents.
Stereoselective Synthesis of 3,6-Disubstituted-3,6-dihydropyridin-2-ones as Potential Diketopiperazine Mimetics Using Organocopper-Mediated <i>a</i><i>nti</i>-S<sub>N</sub>2‘ Reactions and Their Use in the Preparation of Low-Molecule CXCR4 Antagonists
Organocopper-mediated anti-SN2‘ reactions of γ-phosphoryloxy-α,β-unsaturated-δ-lactams were used to prepare highly functionalized diketopiperazine mimetics. The substrate phosphates 24, 32, and 47 were prepared from α-amino acid-derived allylic alcohols 10 by a sequence of reactions that included ring-closing metathesis. In the reactions of phosphates with organocopper reagents, the addition of LiCl
使用有机铜介导的γ-磷酰氧基-α,β-不饱和-δ-内酰胺的抗-S N 2'反应制备高度功能化的二酮哌嗪模拟物。基板磷酸盐24,32,和47从α氨基酸衍生的烯丙醇制备10通过反应,包括闭环复分解的序列。在磷酸盐与有机铜试剂的反应中,添加LiCl可以显着改善抗S N2'选择性,表明含有氯化锂的有机铜簇在确定区域选择性中起重要作用。该反应体系用于制备新型低分子量CXCR4-趋化因子受体拮抗剂。