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Towards the Total Synthesis of Marineosin A: Construction of the Macrocyclic Pyrrole and an Advanced, Functionalized Spiroaminal Model.


ABSTRACT: Herein, we describe the enantioselective construction of the 12-membered macrocyclic pyrrole core 4 of marineosin A in 5.1% overall yield from (S)-propylene oxide. The route features a key Stetter reaction to install a 1,4-diketone, which is then subjected to Paal-Knorr pyrrole synthesis and ring closing metathesis (RCM) to afford macrocycle 4. A divergence point in the synthetic scheme also enabled access to a highly functionalized spiroaminal model system 8 via an acid-mediated hydroxyketoamide cyclization strategy.

PROVIDER: S-EPMC3885260 | BioStudies |

REPOSITORIES: biostudies

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