期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 9, 页码 2870-2874出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201813920
关键词
alkaloids; cyclizations; natural products; rearrangements; total synthesis
资金
- EPFL (Switzerland)
- Swiss National Science Foundation [SNSF 20020-169077]
Controlling the cis C20/C21 relative stereochemistry remains an unsolved issue in the synthesis of eburnane-type indole alkaloids. Provided herein is a simple solution to this problem by developing a unified and diastereoselective synthesis of four representative members of this class of natural products, namely, eburnamonine, larutensine, terengganensine B, and melokhanine E. The synthesis features the following key steps: a) an alpha-iminol rearrangement transforming the 3-hydroxyindolenine into spiroindolin-3-one, b) a highly diastereoselective conformation-directed cyclization leading to the melokhanine skeleton with the desired C20/C21 cis stereochemistry, and c) either an aza-pinacol or an unprecedented alpha-aminoketone rearrangement converting spiroindolinone back into the indole skeleton.
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