Divergent Total Syntheses of (−)‐Daphnilongeranin B and (−)‐Daphenylline
(−)‐Daphnilongeranin B and (−)‐daphenylline are two hexacyclic Daphniphyllum alkaloids, each containing a complex cagelike backbone. Described herein are the first asymmetric total synthesis of (−)‐daphnilongeranin B and a bioinspired synthesis of (−)‐daphenylline with an unusual E ring embedded in...
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Published in | Angewandte Chemie Vol. 130; no. 4; pp. 959 - 963 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
22.01.2018
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Subjects | |
Online Access | Get full text |
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Summary: | (−)‐Daphnilongeranin B and (−)‐daphenylline are two hexacyclic Daphniphyllum alkaloids, each containing a complex cagelike backbone. Described herein are the first asymmetric total synthesis of (−)‐daphnilongeranin B and a bioinspired synthesis of (−)‐daphenylline with an unusual E ring embedded in a cagelike framework. The key features include an intermolecular [3+2] cycloaddition, a late‐stage aldol cyclization to install the F ring of daphnilongeranin B, and a bioinspired cationic rearrangement leading to the tetrasubstituted benzene ring of daphenylline.
Zwei vom gleichen Schlag: Die hexacyclischen Daphniphyllum‐Alkaloide (−)‐Daphnilongeranin B und (−)‐Daphenyllin wurden aus einem gemeinsamen pentacyclischen Intermediat synthetisiert. Schlüsselschritte sind eine intermolekulare [3+2]‐Cyclisierung, eine späte Aldolcyclisierung zur Einführung des Cyclopentenonrings von Daphnilongeranin B und eine bioinspirierte kationische Umlagerung, die zum tetrasubstituierten Benzolring von Daphenyllin führt. |
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Bibliography: | These authors contributed equally. |
ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.201709762 |