3-Ishwarone and 3-Ishwarol, rare sesquiterpenes in essential oil from leaves of Peperomia oreophila Hensch.

Journal of the Brazilian Chemical Society

João Henrique G. Lago²  Alberto De Oliveira¹  Elsie F. Guimarães¹  Massuo J. Kato¹ 

[1] ,Universidade Presbiteriana Mackenzie Centro de Ciências e Humanidades São Paulo SP ,Brazil

关键词: Peperomia oreophila;    essential oil;    ishwarane sesquiterpenes;    3-ishwarol;    3-ishwarone;   

DOI  :  10.1590/S0103-50532007000300022

来源: SciELO

【 摘 要 】

The essential oil from Peperomia oreophila leaves (Piperaceae) was submitted to fractionation in silica gel column. This separation procedure yielded a fraction composed of a hydrocarbon sesquiterpene mixture which was identified as beta-elemene, alpha-ylangene, alpha-guaiene and beta-selinene. Besides, spathulenol and two sesquiterpenes with the rare ishwarane skeleton: 3-ishwarol and 3-ishwarone were also identified. 3-ishwarone was the major component of the crude oil (78% weight). Since the alcohol obtained was not sufficient to allow a complete structural determination, the original ketone was reduced to 3-ishwarol in order to give additional quantities. After the two sesquiterpenes purification, they were characterized by spectrometric techniques (¹H-¹H COSY, HMQC, HMBC and NOESY).

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