Pérez Morales MC, Catalán JV, Domingo V, Jaraíz M, Herrador MM, Quílez del Moral JF, López-Pérez JL, Barrero AF. Structural diversity from the transannular cyclizations of natural germacrone and epoxy derivatives: a theoretical-experimental study.
Chemistry 2013;
19:6598-612. [PMID:
23592563 DOI:
10.1002/chem.201300662]
[Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Indexed: 11/11/2022]
Abstract
Treatment of germacrone (1) with different electrophiles, and of its epoxy derivatives germacrone-4,5-epoxide (2), germacrone-1,10-epoxide (3) and isogermacrone-4,5-epoxide (4) with Brönsted/Lewis acids and Ti(III), gives rise to a great structural diversity. Thus, by using a maximum of two steps, the production of more than 40 compounds corresponding to 14 skeletons is described. Computational calculations rationalizing the structural divergence produced are also described. Finally, since some of the compounds generated are bioactive natural sesquiterpenes, the mechanisms of formation of these substances will provide new insights in their biosynthesis.
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