Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 6, Pages 3050-3057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo502939a
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Funding
- National Institutes of Health [CA17918]
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A chiral benzylic ether serves as an auxiliary for oxindole carboxylation (dr 5.2:1.0) that sets C-10 configuration in a potential diazonamide precursor. The chiral substituent allows diastereomer separation and departs during a subsequent acid-catalyzed ring closure to form a tetracyclic aminal. With suitable N-protection, crystallization affords the aminal with 9899% ee.
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