Identifying the targets of bioactivesmallmolecules is a challenging endeavor for which no general solution currently exists. Classical affinity purification experiments suffer from the need to functionalise a bioactive compound and link it to a solid support, which may interfere with target binding. A modern mass spectrometry-based proteomics technique that has partially circumvented this problem
Providing a New Aniline Bioisostere through the Photochemical Production of 1-Aminonorbornanes
作者:Daryl Staveness、Taylor M. Sodano、Kangjun Li、Elizabeth A. Burnham、Klarissa D. Jackson、Corey R.J. Stephenson
DOI:10.1016/j.chempr.2018.10.017
日期:2019.1
This report describes the photochemical conversion of aminocyclopropanes into 1-aminonorbornanes via formal [3 + 2] cycloadditions initiated by homolytic fragmentation of amine radical cation intermediates. Aligning with the modern movement toward sp(3)-rich motifs in drug discovery, this strategy provides access to a diverse array of substitution patterns on this saturated carbocyclic framework while offering the robust functional-group tolerance (e.g., -OH, -NHBoc) necessary for further derivatization. Evaluating the metabolic stability of selected morpholine-based 1-aminonorbornanes demonstrated a low propensity for oxidative processing and no proclivity toward reactive metabolite formation, suggesting a potential bioisosteric role for 1-aminonorbornanes. Continuous-flow processing allowed for efficient operation on the gram scale, providing promise for translation to industrially relevant scales. This methodology only requires low loadings of a commercially available, visible-light-active photocatalyst and a simple salt; thus, it stays true to sustainability goals while readily delivering saturated building blocks that can reduce metabolic susceptibility within drug development programs.
Total Synthesis of (−)-Salicylihalamide
作者:Alois Fürstner、Thorsten Dierkes、Oliver R. Thiel、Gaetano Blanda
the catalyst which bears an imidazol-2-ylidene ligand. The EIZ ratio obtained in this macrocyclizationreaction was determined by the protecting groups at the remote phenolic OH group of the cyclization precursor. The elaboration of the resulting cycloalkene 37 into the final target involved a CrCl2-mediated synthesis of vinyliodide 49 which, after deprotection, did undergo a copper-catalyzed cross-coupling