Site‐Selective Nitrene Transfer to Conjugated Olefins Directed by Oxazoline Peptide Ligands
作者:Golo Storch、Naudin Heuvel、Scott J. Miller
DOI:10.1002/adsc.201900631
日期:2020.1.23
Site‐selective nitrenetransfer to di‐ and polyene substrates has been achieved using designed peptide‐embedded bioxazoline ligands capable of binding copper. In model 1,3‐diene substrates, the olefinic position proximal to a directing group was selectively functionalized. Additional studies indicate that this selectivity stems from non‐covalent substrate‐catalyst interactions. The peptide‐mediated nitrene transfer
Protein knockdown can be achieved by the use of a small molecule that possesses affinity for both the target protein and ubiquitin ligase. We have designed such a degradation-inducing molecule targeting cIAP1 and CRABP-II, which are involved in proliferation of several cancer cell lines and in neuroblastoma growth, respectively. As a CRABP-II-recognizing moiety, all-trans retinoic acid ( ATRA, 3), a physiological ligand of CRABP, was chosen. As a cIAP1-recognizing moiety, MV1 ( 5), which is a cIAP1/cIAP2/XIAP panligand, was chosen. Although cIAP1 itself possesses ubiquitin ligase activity, we expected that its decomposition would be efficiently mediated by related molecules, including cIAP2 and XIAP, which also possess ubiquitin ligase activity. The designed degradation inducer 6, in which ATRA ( 3) and MV1 ( 5) moieties are connected via a linker, was synthesized and confirmed to induce efficient degradation of both cIAP1 and CRABP-II. It showed potently inhibited the proliferation of IMR32 cells. (C) 2012 Elsevier Ltd. All rights reserved.