Contribuição ao estudo químico de Piper divaricatum e Schinus terebinthifolius.

Abstract

This work describes the phytocemical investigation of the extracts from roots of Piper divaricatum (Piperaceae), and, the volatile chemical composition of the essential oils Schinus terebinhtifolius Raddi (Anacardiaceae). The chemical investigation of the extracts of P. divaricatum, using classic methods of chromatography on sílica gel, yelded an amide, (2E,4E)-pentadienamide, 5-(1,3-benzodioxol-5-yl)-N-(2-methylpropyl)- (piperlonguminine), and two benzoic acid derivatives , 3,4-dy-hidroxy- 5-(2’E,6’Z,10’E)-7’-(hydroxymethyl)-3’,11’,15’-trimethyl-hexadeca-2’,6’,10’,14’- tetraenyl), and the ácid 3,4-dyhydroxy-5-(2’E,6’E,10’E)-3’,7’,11’,15’- tetramethylhexadeca-2’,6’,10’,14’-tetraenyl) benzoic, this being reported for the first time in the literature. The structures of all isolated compounds were elucidated by spectroscopic methods, such as ME, IR and INMR, including 1D and 2D experimentals NMR spectroscopy and, comparison with published data for closely related compounds. The chemical composition of the essential oils from leaves of Schinus terebinthifolius , was analyzed by CG-MS and GC-FID. Fourteen components of plant 1, representing an average of more than 81.0% of the chemical compositions of the oils, were identified and eight compounds of plant 2, representing more than 98,0% in average. Both oils showed higher concentrations of monoterpenoids, but they showed different chemical compositions, whereas cis-ocimene (52%) and ß-ocimene (19%) were major constituents of plant 1, while limonene (93%) is the major component of plant 2.