Synthesis of a Novel Suppressor of β-Cell Apoptosis via Diversity-Oriented Synthesis
摘要:
The synthesis of a stereochemically diverse library of medium-sized rings accessible via a "build/couple/pair" strategy is described. Key aspects of the synthesis include SNAr cycloetherification of a linear amine template to afford eight stereoisomeric eight-membered lactams and subsequent solid-phase diversification of these scaffolds to yield a 6488-membered library. Screening of this compound collection in a cell-based assay for the suppression of cytokine-induced beta-cell apoptosis resulted in the identification of a small-molecule suppressor capable of restoring glucose-stimulated insulin secretion in a rat beta-cell line. The presence of all stereoisomers in the screening collection enabled preliminary determination of the structural and stereochemical requirements for cellular activity, while efficient follow-up chemistry afforded BRD0476 (probe ML187), which had an approximately 3-fold increase in activity. These results demonstrate the utility of diversity-oriented synthesis to probe discovery using cell-based screening and the importance of including stereochemical diversity in screening collections for the development of stereo/structure-activity relationships.
Build/Couple/Pair Strategy for the Synthesis of Stereochemically Diverse Macrolactams via Head-to-Tail Cyclization
作者:Mark E. Fitzgerald、Carol A. Mulrooney、Jeremy R. Duvall、Jingqiang Wei、Byung-Chul Suh、Lakshmi B. Akella、Anita Vrcic、Lisa A. Marcaurelle
DOI:10.1021/co200161z
日期:2012.2.13
A build/couple/pair (B/C/P) strategy was employed to generate a library of 7936 stereochernically diverse 12-membered macrolactams. All 8 stereoisomers of a common linear amine precursor were elaborated to form the corresponding 8 stereoisomers of two regioisomeric macrocyclic scaffolds via head-to-tail cyclization. Subsequently,these 16 scaffolds were further diversified via capping of two amine functionalities on SynPhase Lanterns. Reagents used for solid-phase diversification were selected using a sparse matrix design strategy with the aim of maximizing coverage of chemical space while adhering to a preset range of physicochemical properties.