RESUMO
The lichen Pseudocyphellaria coriifolia is a species endemic to southern South America. From the lichen thallus, methyl evernate, tenuiorin and three hopane triterpenoids were isolated and identified as the main lichen constituents. Their trypanocidal effects were screened against epimastigotes of Trypanosoma cruzi. The results of the biological test showed that some hopane terpenoids exhibit antiparasitic properties.
Assuntos
Depsídeos/química , Líquens/química , Triterpenos/química , Tripanossomicidas/química , Tripanossomicidas/farmacologia , Depsídeos/farmacologia , Triterpenos/farmacologia , Trypanosoma cruzi/efeitos dos fármacosRESUMO
Two new compounds 2ß-acetoxy-15-phenyl-(22,25-acetoxy)-ent-labda-8(17), 13(E)-diene (9) and 2ß-hydroxy-15-phenyl-(22,24,26-trimethoxy)-ent-labda-8(17),13(E)-diene (10) have been prepared by an Electrophilic Aromatic Substitution (EAS) reaction between diterpenyl allylic alcohols and 1,4-hydroquinone or 1,3,5-trimethoxybenzene using BF(3).Et(2)O as a catalyst. These compounds, along with a series of natural ent-labdanes 3-8, have been evaluated for their in vitro cytotoxic activities against cultured human cancer cells of PC-3 and DU-145 human prostate cancer, MCF-7 and MDA-MB-231 breast carcinoma and dermal human fibroblasts (DHF). Some compounds displayed inhibition at µM IC(50 )values.
Assuntos
Antineoplásicos/síntese química , Diterpenos/química , Hidroquinonas/síntese química , Hidroquinonas/farmacologia , Antineoplásicos/farmacologia , Neoplasias da Mama/tratamento farmacológico , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Feminino , Fibroblastos/efeitos dos fármacos , Humanos , Concentração Inibidora 50 , Masculino , Neoplasias da Próstata/tratamento farmacológicoRESUMO
The synthesis and structural determination of two new diterpenylhydroquinones: 2beta-acetoxy-15-phenyl-(22,25-dihydroxy)-ent-labda-8(17),13(E)-diene(1) and 2beta-hydroxy-15-phenyl-(22,25-dihydroxy)-ent-labda-8(17),13(E)-dieneis reported (2). These compounds were obtained by coupling via Electrophilic Aromatic Substitution (EAS) of 1,4-hydroquinone with primary or tertiary allyl alcohol derivatives of the natural ent-labdanes 3 and 4. With this new method, the best results were observed when mixtures of the primary alcohol derivatives 5-6 (26% yield of compound 1) and diol derivatives 9-10 (28% yield of compound 2) were used.
Assuntos
Diterpenos/química , Diterpenos/síntese química , Hidroquinonas/química , Hidroquinonas/síntese química , Espectroscopia de Ressonância Magnética , Estrutura MolecularRESUMO
A route for the degradation of the side chain of ent-labdane derivatives has been devised, giving the useful synthon 2beta,12-dihydroxy-13,14,15,16,17-pentanor-ent-labdane-8-one (8). The use of this compound in the preparation of terpenylquinone derivatives shall be reported elsewhere. In addition we have synthesized the compound 2beta,12-diacetoxy-8beta,17-epoxy-13,14,15,16-tetranor-ent-labdane (10), which upon catalytic epoxide ring opening in alkaline or acid media gave rise in all cases to the formation of tricyclicc ompounds.