A Concise Enantioselective Total Synthesis of (−)‐Deoxoapodine
We have established a highly convergent 10‐step route for the total synthesis of (−)‐deoxoapodine, which is a hexacyclic aspidosperma alkaloid. The quaternary C5 center of the characteristic tetrahydrofuran ring was constructed by a chiral‐phosphoric‐acid‐catalyzed enantioselective bromocycloetherif...
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Published in | Angewandte Chemie International Edition Vol. 59; no. 51; pp. 23089 - 23093 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Wiley
14.12.2020
Wiley Subscription Services, Inc |
Edition | International ed. in English |
Subjects | |
Online Access | Get full text |
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Summary: | We have established a highly convergent 10‐step route for the total synthesis of (−)‐deoxoapodine, which is a hexacyclic aspidosperma alkaloid. The quaternary C5 center of the characteristic tetrahydrofuran ring was constructed by a chiral‐phosphoric‐acid‐catalyzed enantioselective bromocycloetherification in a 5‐endo fashion and subsequent allylation by using the Keck protocol. Construction of the aspidosperma skeleton features the formation of a nine‐membered lactam by a catalytic C−H palladation/alkylation cascade at the indole 2‐position and an iron‐catalyzed oxidative transannular reaction at a late‐stage of the synthesis.
In a highly convergent route to (−)‐deoxoapodine, the quaternary center of the tetrahydrofuran ring was formed by an enantioselective organocatalytic bromocycloetherification reaction and subsequent Keck allylation. The aspidosperma skeleton was constructed by a C−H palladation/alkylation cascade at the indole 2‐position to form a nine‐membered lactam and an iron‐catalyzed oxidative transannular reaction at a late stage of the synthesis (see scheme). |
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Bibliography: | These authors contributed equally to this work. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 |
DOI: | 10.1002/anie.202010759 |