Radical arylation of tyrosine residues in peptides
作者:Stefanie K. Fehler、Gerald Pratsch、Christiane Östreicher、Michael C.D. Fürst、Monika Pischetsrieder、Markus R. Heinrich
DOI:10.1016/j.tet.2016.04.084
日期:2016.12
arylation of the phenolic side chain of tyrosine in peptides was investigated. Aryl radicals were generated from aryldiazonium salts using titanium(III) chloride as stoichiometric reductant. Due to the high selectivity with which 3-aryltyrosine derivatives were formed, this reaction type represents a new strategy for the direct functionalization of peptides.
Synthesis and Biological Evaluation of Biphenyl Amides That Modulate the US28 Receptor
作者:Ana Kralj、Elif Kurt、Nuska Tschammer、Markus R. Heinrich
DOI:10.1002/cmdc.201300369
日期:2014.1
To prepare and biologicallyevaluate 38 new potential US28 allosteric modulators, we employed a straightforward synthetic route involving radical arylation. The study was based on a former lead structure but with the dihydroisoquinolinone moiety replaced by substituted biphenyls. The investigation of structure–activity relationships among the new biphenyl‐derived ligands led to a preliminary pharmacophore
The Gomberg-Bachmann Reaction for the Arylation of Anilines with Aryl Diazotates
作者:Gerald Pratsch、Tina Wallaschkowski、Markus R. Heinrich
DOI:10.1002/chem.201200430
日期:2012.9.10
Simply aqueous sodium hydroxide is sufficient to exclude ionic side reactions and to prepare 2‐aminobiphenyls from aryldiazotates and anilines through a new variant of the Gomberg–Bachmannreaction (see scheme). The metal‐free reaction under basic conditions allows to exploit the highly radical‐stabilizing effect of the aniline's free amino function for the first time, which leads to a so far unreached
作者:Lisa-Marie Altmann、Michael C. D. Fürst、Eva I. Gans、Viviane Zantop、Gerald Pratsch、Markus R. Heinrich
DOI:10.1021/acs.orglett.9b04237
日期:2020.1.17
Aryl radicals generated in the aqueous phase of biphasic mixtures have-regardless of a comparably low polarity- a strong preference to react with aromatic substrates in the aqueous phase and not to undergo phase-transfer into a lipophilic phase, independent from the presence of a surfactant. These results represent an important prerequisite toward future studies in biological systems, which typically
Die vorliegende Erfindung beschreibt ein Verfahren zur Synthese von 2-Aminobiphenylen sowie Derivaten davon. Dieses Verfahren ist kostengünstig durchführbar und beruht auf selektiven Umsetzungen. Funktionalisierte Biphenylverbindungen sind insbesondere als Pharmazeutika und Pflanzenschutzmittel sowie als Vorstufen solcher Wirkstoffe von großem Interesse. Das Verfahren zur Herstellung einer Verbindungen der Formel 3 ist dadurch gekennzeichnet, dass eine Verbindung der Formel 1 mit einer Verbindung der Formel 2 umgesetzt wird.