Conformationally restricted, spatially defined 12-30 membered macrocyclic ring systems of formulae Ia and Ib are constituted by three distinct molecular parts: Template A, conformation Modulator B and Bridge C. These macrocycles Ia and Ib are readily manufactured by parallel synthesis or combinatorial chemistry in solution or on solid phase. They are designed to interact with a variety of specific biological target classes, examples being the agonistic or antagonistic activity on G-protein coupled receptors (GPCRs), ion channels and signal transduction pathways. In particular, these macrocycles act as antagonists of the motilin receptor, the FP receptor and the purinergic receptors P2Y
1
, as modulators of the serotonin receptor of subtype 5-HT
2B
, as blockers of the voltage-gated potassium channel K
v
1.3 and as inhibitors of the β-catenin-dependent “canonical” Wnt pathway. Thus they are showing great potential as medicaments for a variety of diseases.
A stereocontrolled totalsynthesis of the cyclodepsipeptide, itralamide B, has been achieved. Both R - and S -stereoisomers of the side chain were attached to the macrocyclic ring, however, the synthesized structure appears to be different from that of the marine natural product.
环缩肽、itralamide B 的立体控制全合成已经实现。侧链的 R - 和 S - 立体异构体都连接到大环上,但是,合成的结构似乎与海洋天然产物的结构不同。
Conformationally restricted, spatially defined 12-30 membered macrocyclic ring systems of formulae Ia and Ib are constituted by three distinct molecular parts: Template A, conformation Modulator B and Bridge C. These macrocycles Ia and Ib are readily manufactured by parallel synthesis or combinatorial chemistry in solution or on solid phase. They are designed to interact with a variety of specific biological target classes, examples being the agonistic or antagonistic activity on G-protein coupled receptors (GPCRs), ion channels and signal transduction pathways. In particular, these macrocycles act as antagonists of the motilin receptor, the FP receptor and the purinergic receptors P2Y1, as modulators of the serotonin receptor of subtype 5-HT2B, as blockers of the voltage-gated potassium channel Kv1.3 and as inhibitors of the β-catenin-dependent "canonical" Wnt pathway. Thus they are showing great potential as medicaments for a variety of diseases.
Systematic Chemical Mutagenesis Identifies a Potent Novel Apratoxin A/E Hybrid with Improved in Vivo Antitumor Activity
作者:Qi-Yin Chen、Yanxia Liu、Hendrik Luesch
DOI:10.1021/ml200176m
日期:2011.11.10
Apratoxins are cytotoxic marine natural products that prevent cotranslational translocation early in the secretory pathway. We showed that apratoxins downregulate receptors and growth factor ligands, giving a one–two punch to cancer cells, particularly those that rely on autocrine loops. Through total synthesis, we tested the effects of amino acid substitutions, including alanine scanning, on the downregulation