Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 1, Pages 528-547Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo502534g
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Funding
- NIH-NIGMS [R01GM080269]
- Amgen
- Gordon and Betty Moore Foundation
- Caltech
- Fulbright [15111120]
- Ilju Foundation of Education Culture
- German Academic Exchange Service (DAAD)
- Bristol-Myers Squibb
- California TRDRP [14FT-0002]
- Swiss National Science Foundation
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Expedient synthetic approaches to the highly functionalized polycyclic alkaloids communesin F and perophoramidine are described using a unified approach featuring a key decarboxylative allylic alkylation to access a crucial and highly congested 3,3-disubstituted oxindole. Described are two distinct, stereoselective alkylations that produce structures in divergent diastereomeric series possessing the critical vicinal all-carbon quaternary centers needed for each synthesis. Synthetic studies toward these challenging core structures have revealed a number of unanticipated modes of reactivity inherent to these complex alkaloid scaffolds. Additionally, several novel and interesting intermediates en route to the target natural products, such as an intriguing propellane hexacyclic oxindole encountered in the communesin F sequence, are disclosed. Indeed, such unanticipated structures may prove to be convenient strategic intermediates in future syntheses.
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