Facile access to (Z)-alkene-containing diketopiperazine mimetics utilizing organocopper-mediated anti-SN2′ reactions
摘要:
Regio- and stereoselective anti-S(N)2' alkylation of 7-phosphoryloxy-alpha,beta-unsaturated-delta-lactams with organocopper reagents allowing the preparation of N-alkylated-alpha,delta-substituted-beta,gamma-unsaturated-delta-lactams as highly functionalized diketopiperazine mimetics is presented. (c) 2005 Elsevier Ltd. All rights reserved.
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。