The electrocatalytic ring-opening dihydroalkoxylation of N-aryl maleimides with alcohols under metal- and oxidant-free conditions is described. This electrochemical process consists of anodic single-electron transfer oxidation, cathodic radical reduction, rearrangement-ring cleavage and nucleophilic addition cascade, which employs tetrabutylammonium bromide not only as a redox catalyst but also as
Rhodium(III)-Catalyzed C–H Alkenylation: Access to Maleimide-Decorated Tryptophan and Tryptophan-Containing Peptides
作者:Jingjing Peng、Chunpu Li、Mirzadavlat Khamrakulov、Jiang Wang、Hong Liu
DOI:10.1021/acs.orglett.0c00086
日期:2020.2.21
Maleimide is widely applied in many fields, especially in antibody-drug conjugations and peptide drugs. Herein, we develop a strategy for the C-H alkenylation of tryptophan and tryptophan-containing peptides, providing a synthetic route of decorating maleimide on peptides. The method has a high tolerance of functional groups and protecting groups. Furthermore, this method was applied to prepare peptide conjugation with molecules such as drugs and fluorescence probes. Moreover, macrocyclic peptides were obtained via this reaction.
Bicyclic α-Iminophosphonates as High Affinity Imidazoline I<sub>2</sub> Receptor Ligands for Alzheimer’s Disease
作者:Sònia Abás、Sergio Rodríguez-Arévalo、Andrea Bagán、Christian Griñán-Ferré、Foteini Vasilopoulou、Iria Brocos-Mosquera、Carolina Muguruza、Belén Pérez、Elies Molins、F. Javier Luque、Pilar Pérez-Lozano、Steven de Jonghe、Dirk Daelemans、Lieve Naesens、José Brea、M. Isabel Loza、Elena Hernández-Hernández、Jesús A. García-Sevilla、M. Julia García-Fuster、Milica Radan、Teodora Djikic、Katarina Nikolic、Mercè Pallàs、Luis F. Callado、Carmen Escolano
DOI:10.1021/acs.jmedchem.9b02080
日期:2020.4.9
Imidazoline I2 receptors (I2-IR), widely distributed in the CNS and altered in patients that suffer from neurodegenerative disorders, are orphans from a structural point of view, and new I2-IR ligands are urgently required for improving their pharmacological characterization. We report the synthesis and three-dimensional quantitative structure–activity relationship (3D-QSAR) studies of a new family