3 years ago

Asymmetric Total Syntheses of Communesin F and a Putative Member of the Communesin Family

Asymmetric Total Syntheses of Communesin F and a Putative Member of the Communesin Family
David Y.-K. Chen, Alexandre Jean, Jisook Park
Here we report asymmetric total syntheses of communesin F and a putative member of the communesin family of bis-aminal alkaloid natural products. The successful strategy featured the invention of an asymmetric organocatalytic reaction to unify two oxindole subunits, a Ti(OiPr)4-mediated dehydrative skeletal rearrangement, and a late-stage Pd(OAc)2-catalyzed directed CH-alkenylation reaction. Collectively, the synthetic technologies disclosed herein enabled the preparation of a late-stage polycyclic intermediate catered for the synthesis of both naturally occurring and designed communesins. More importantly, speculated and yet to be discovered member(s) of the communesin family can now be accessed to facilitate a better understanding of the communesin biosynthetic network. A challenging framework: Total syntheses of communesin F and a putative member of the communesin family of bis-aminal natural products have been accomplished. The salient features of the developed synthetic sequence involves a novel asymmetric organocatalytic reaction to furnish the vicinal quaternary centers of the target molecule, and a highly effective CH-alkenylation reaction at late stage of the synthesis.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707806

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