of the furo[3,2‐b]pyridine core as a novel scaffold for potent and highly selective inhibitors of cdc‐like kinases (CLKs) and efficient modulators of the Hedgehog signaling pathway. Initially, a diverse target compound set was prepared by synthetic sequences based on chemoselective metal‐mediatedcouplings, including assembly of the furo[3,2‐b]pyridine scaffold by copper‐mediated oxidative cyclization
Regioselective Suzuki couplings of non-symmetric dibromobenzenes: alkenes as regiochemical control elements
作者:Peng Zhao、Marshall D. Young、Christopher M. Beaudry
DOI:10.1039/c5ob00717h
日期:——
Suzuki couplings of non-symmetric dibromobenzenes is investigated. Selectivities are dependent on the proximity of the bromineatom to alkene substituents, not on steric or electronic effects. Extension to a one-pot three-component Suzuki reaction leads to efficient terphenyl syntheses.
Ligand Dependent Switch from RXR Homo- to RXR-NURR1 Heterodimerization
作者:Marcel Scheepstra、Sebastian A. Andrei、Rens M. J. M. de Vries、Femke A. Meijer、Jian-Nong Ma、Ethan S. Burstein、Roger Olsson、Christian Ottmann、Lech-Gustav Milroy、Luc Brunsveld
DOI:10.1021/acschemneuro.7b00216
日期:2017.9.20
Retinoid X receptors (RXRs) play key roles in many physiological processes in both the periphery and central nervous system. In addition, RXRs form heterodimers with other nuclear receptors to exert their physiological effects. The nuclear receptor related 1 protein (NURR1) is particularly interesting because of its role in promoting differentiation and survival of dopamine neurons. However, only a small number of RXR-heterodimer selective modulators are available, with limited chemical diversity. This work describes the synthesis, biochemical evaluation, and structural elucidation of a novel series of RXR ligands with strongly biased interactions with RXRa-NURRI heterodimers. Targeted modifications to the small molecule biaryl scaffold caused local RXRa side -chain disturbances and displacement of secondary structural elements upon ligand binding. This resulted in the repositioning of protein helices in the heterodimer interface of RXRa, alterations in homo- versus heterodimer formation, and modulation of activation function 2 (AF2). The data provide a rationale for the design of RXR ligands consisting of a highly conserved hydrophilic region, strongly contributing to the ligand affinity, and a variable hydrophobic region, which efficiently probes the effects of structural changes at the level of the ligand on co -regulator recruitment or the RXRa-NURRI dimerization interface.