Zhang Z, Sun H, Zhang M, Song S, Peng M, Dai W, Wang Y, Yu F. Switchable Skeletal Rearrangement of Hexahydro-4
H-indol-4-ones: Divergent Synthesis of Dihydroxy-4
H-cyclopenta[
b]pyridin-4-ones and 8-Alkenyl Oxepane-2,6-diones.
Org Lett 2024;
26:4205-4211. [PMID:
38743606 DOI:
10.1021/acs.orglett.4c00908]
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Abstract
An unprecedented base-controlled selective skeletal rearrangement reaction of hexahydro-4H-indol-4-ones has been developed. In this protocol, highly functionalized dihydroxy-4H-cyclopenta[b]pyridin-4-ones and 8-alkenyl oxepane-2,6-diones were prepared with a broad substrate scope and high chemoselectivity in moderate to excellent yields selectively by modulating LiOH and Et3N. In addition, the newly formed 8-alkenyl oxepane-2,6-dione scaffolds could be easily further derivatized to 5-(pyrrol-2-yl)dihydrofuran-2(3H)-ones through a rare intramolecular rearrangement reaction.
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