A little inspiration: The systematic preparation of sixteen natural product‐inspired polyhydroylated pyrrolidine‐based isomeric scaffolds is described. Each scaffold possesses four stereogenic centers and one exo‐aminomethyl moiety, which allows for rapid substituent diversity. To exemplify biological applications, these new privileged scaffolds were used to discover new human Golgi α‐mannosidase II inhibitors. The most potent inhibitor shows competitive behavior with a Ki value of 24 nM.
The preparation of natural product-like polyhydroxylated pyrrolidine and piperidine alkaloids using a combination of solid- and solution-phase organic synthesis is described. The key intermediates, enantiopure five- or six-membered tri-O-benzyl cyclic nitrones, were efficiently prepared on solid support from accessible chiral furanosides and pyranosides, respectively. The substituent diversity was achieved by a diastereoselective addition of a variety of Grignard reagents to the cyclic nitrones in solution-phase synthesis. All reaction steps and work-up procedures were modified to allow the use of automated equipment. A 36-membered demonstration library with three diversity elements (core, configuration, and substituent) was prepared in good yield and purity.
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