Stereoselective synthesis of trifluoro- and monofluoro-analogues of frontalin and evaluation of their biological activity.
J Org Chem
; 66(25): 8336-43, 2001 Dec 14.
Article
en En
| MEDLINE
| ID: mdl-11735511
ABSTRACT
The stereoselective synthesis of both enantiomers of trifluoro frontalin (-)-(1S,5R)- and (+)-(1R,5S)-8, as well as of diastereomeric monofluoro frontalines (-)-(1R,2R,5R)-18 and (-)-(1R,2S,5R)-20, analogues of the bioactive component of the aggregation pheromone of the Scolytidae insect family, has been accomplished starting from (-)-(1R)- and (+)-(1S)-menthyl (S)-toluene-4-sulfinate as a source of chirality and methyl trifluoroacetate or fluoroacetate, respectively, as sources of fluorine. The C-1 stereocenters were installed via stereoselective epoxidation of beta-sulfinyl ketones 2 and 13 with diazomethane. The bicyclic core was obtained by totally stereocontrolled and chemoselective tandem Wacker oxidation/intramolecular ketalization of the intermediate unsatured sulfinyl diols 5, 15, and 19. Axially fluorinated (-)-20 elicited a strong electroantennographic response in laboratory tests on females of Dendroctonus micans, whereas equatorially fluorinated (-)-18 and the trifluoroanalogue (-)-8 showed modest responses. Field trials using (-)-20 were not indicative owing to the locally scarce population of D. micans, but it showed some attractiveness for other Coleoptera families.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Feromonas
/
Compuestos Bicíclicos Heterocíclicos con Puentes
Límite:
Animals
Idioma:
En
Revista:
J Org Chem
Año:
2001
Tipo del documento:
Article
País de afiliación:
Italia