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C 3 ‐Symmetric Trisimidazoline‐Catalyzed Enantioselective Bromolactonization of Internal Alkenoic Acids
Author(s) -
Murai Kenichi,
Nakamura Akira,
Matsushita Tomoyo,
Shimura Masato,
Fujioka Hiromichi
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201200647
Subject(s) - enantioselective synthesis , olefin fiber , catalysis , chemistry , bromine , organic chemistry , antifungal , combinatorial chemistry , medicine , dermatology
A method for conducting enantioselective bromolactonization reactions of trisubstituted alkenoic acids, using the C 3 ‐symmetric trisimidazoline 1 and 1,3‐dibromo‐5,5‐dimethyl hydantoin as a bromine source, has been developed. The process generates chiral δ‐lactones that contain a quaternary carbon. The results of studies probing geometrically different olefins show that ( Z )‐olefins rather than ( E )‐olefins are favorable substrates for the process. The method is not only applicable to acyclic olefin reactants but can also be employed to transform cyclic trisubstituted olefins into chiral spirocyclic lactones. Finally, the synthetic utility of the newly developed process is demonstrated by its application to a concise synthesis of tanikolide, an antifungal marine natural product.