Sesquiterpenes from lippia integrifolia essential Oil
Four sesquiterpenes (1-4) with the africanane skeleton [of which only 5-africanene (1) has been previously reported] and the new asteriscane derivative asterisca-3(15),6-diene (5) were isolated from the essential oil of Lippia integrifolia. A further new compound, african-2(6)-ene (7), was obtained as a semisynthetic product by derivatization of isoafricanol (6). The structures of the new compounds were assigned on the basis of spectroscopic data, enantioselective gas chromatography, and by chemical correlations.
Fricke
C
Institut fur Organische Chemie, Universitat Hamburg, D-20146 Hamburg, Germany, Robertet S.A., F-06130 Grasse, France, and Facultad de Ciencias Exactas, Universidad Nacional de Cordoba, 5000 Cordoba, Argentina.
Hardt
IH
Konig
WA
Joulain
D
Zygadlo
JA
Guzman
CA