Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 46, Pages 24484-24487Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110556
Keywords
cochlearol B; intramolecular [2+2] photocycloaddition; natural product; oxidative cyclization; total synthesis
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Funding
- JSPS KAKENHI [JP16K08180, JP18K14876, JP19K06981, JP21K14797]
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In this study, the first total synthesis of cochlearol B, a meroterpenoid natural product with a unique pentacyclic structure, was described. Key steps including oxidative cyclization and subsequent intramolecular [2+2] photocycloaddition allowed efficient access to cochlearol B with a longest linear sequence of 16 steps and 9% overall yield. Single-crystal X-ray crystallographic analysis confirmed the stereochemistry of cochlearol B.
Herein, we describe the first total synthesis of cochlearol B, a meroterpenoid natural product featuring a 4/5/6/6/6-fused pentacyclic structure. Key steps, oxidative cyclization and subsequent intramolecular [2+2] photocycloaddition, which constructed the pentacyclic structure in highly stereoselective manner, allowed efficient access to cochlearol B with the longest linear sequence of 16 steps, and in 9 % overall yield. Single-crystal X-ray crystallographic analysis clearly confirmed the stereochemistry of cochlearol B.
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