Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115384
Keywords
Achmatowicz rearrangement; Indole diterpenes; Natural products; Ring-closing metathesis; Total synthesis
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Funding
- Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) [SMSEGL20Sc01-B]
- National Natural Science Foundation of China [NSFC 21772167]
- Research Grant Council of Hong Kong [C6026-19G, 16307219, 16304618, 16306920]
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The asymmetric total syntheses of three paspaline-derived IDTs were reported, featuring green Achmatowicz rearrangement/bicycloketalization and cascade ring-closing metathesis of dienyne, as well as four palladium-mediated reactions. These synthetic strategies are expected to facilitate the chemical synthesis of other paspaline-derived IDTs and further bioactivity studies.
Paspaline-derived indole diterpenes (IDTs) are structurally complex mycotoxins with unique tremorgenic activity. Reported are asymmetric total syntheses of three paspaline-derived IDTs paspalicine, paspalinine and paspalinine-13-ene. Our synthesis features a green Achmatowicz rearrangement/bicycloketalization for the efficient construction of FG rings (75 % yield) and a cascade ring-closing metathesis of dienyne for highly regioselective formation of CD rings (72 % yield). Other highlights include four palladium-mediated reactions (Stille, aza-Wacker, Suzuki, and Heck) to forge the BE rings and the installation of two continuous all-carbon quaternary stereocenters via reductive ring-opening of cyclopropane and alpha-methylation of the conjugate ester. Our new synthetic strategy is expected to be applicable to the chemical synthesis of other paspaline-derived IDTs and will facilitate the bioactivity studies of these agriculturally and pharmacologically important IDTs.
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