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Bioinspired Synthesis of (−)‐PF‐1018
Author(s) -
QuintelaVarela Hugo,
Jamieson Cooper S.,
Shao Qianzhen,
Houk K. N.,
Trauner Dirk
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201912452
Subject(s) - polyene , cycloaddition , deoxygenation , pericyclic reaction , chemistry , natural product , homolysis , combinatorial chemistry , cascade , computational chemistry , biomimetic synthesis , radical , stereochemistry , organic chemistry , catalysis , chromatography
The combination of electrocyclizations and cycloadditions accounts for the formation of a range of fascinating natural products. Cascades consisting of 8π electrocyclizations followed by a 6π electrocyclization and a cycloaddition are relatively common. We now report the synthesis of the tetramic acid PF‐1018 through an 8π electrocyclization, the product of which is immediately intercepted by a Diels–Alder cycloaddition. The success of this pericyclic cascade was critically dependent on the substitution pattern of the starting polyene and could be rationalized through DFT calculations. The completion of the synthesis required the instalment of a trisubstituted double bond by radical deoxygenation. An unexpected side product formed through 4‐ exo ‐trig radical cyclization could be recycled through an unprecedented triflation/fragmentation.