RESUMO
One new diterpenoid, diaporpenoid A (1), two new sesquiterpenoids, diaporpenoids B-C (2,3) and three new α-pyrone derivatives, diaporpyrones A-C (4-6) were isolated from an MeOH extract obtained from cultures of the mangrove endophytic fungus Diaporthe sp. QYM12. Their structures were elucidated by extensive analysis of spectroscopic data. The absolute configurations were determined by electronic circular dichroism (ECD) calculations and a comparison of the specific rotation. Compound 1 had an unusual 5/10/5-fused tricyclic ring system. Compounds 1 and 4 showed potent anti-inflammatory activities by inhibiting the production of nitric oxide (NO) in lipopolysaccharide (LPS)-induced RAW264.7 cells with IC50 values of 21.5 and 12.5 µM, respectively.
Assuntos
Anti-Inflamatórios/metabolismo , Endófitos/metabolismo , Extratos Vegetais/metabolismo , Rhizophoraceae/metabolismo , Animais , Anti-Inflamatórios/isolamento & purificação , Anti-Inflamatórios/farmacologia , Endófitos/isolamento & purificação , Fungos/isolamento & purificação , Fungos/metabolismo , Macrófagos/efeitos dos fármacos , Macrófagos/metabolismo , Camundongos , Extratos Vegetais/isolamento & purificação , Extratos Vegetais/farmacologia , Células RAW 264.7RESUMO
Five new polyketides, colletotric B (2), 3-hydroxy-5-methoxy-2,4,6-trimethylbenzoic acid (3), colletotric C (4), chaetochromone D (6) and 8-hydroxy-pregaliellalactone B (9), together with four known analogues (1, 5 and 7-8) were isolated from the mangrove endophytic fungus Phoma sp. SYSU-SK-7. Their structures were elucidated by analysis of extensive spectroscopic data and mass spectrometric data. Compounds 1-2 showed strong antimicrobial activity against the P. aeruginosa, MRSA and C. albicans with the MIC values in the range of 1.67-6.28⯵g/ml. Furthermore, Compounds 1-5 also exhibited significant α-glucosidase inhibitory activity with the IC50 values in the range of 36.2-90.6⯵M. Compound 7 was found to inhibited radical scavenging activity against DPPH with the EC50 value of 11.8⯵M.
Assuntos
Anti-Infecciosos/farmacologia , Ascomicetos/química , Sequestradores de Radicais Livres/farmacologia , Inibidores de Glicosídeo Hidrolases/farmacologia , Policetídeos/farmacologia , Rhizophoraceae/microbiologia , Anti-Infecciosos/isolamento & purificação , China , Endófitos/química , Sequestradores de Radicais Livres/isolamento & purificação , Inibidores de Glicosídeo Hidrolases/isolamento & purificação , Testes de Sensibilidade Microbiana , Estrutura Molecular , Policetídeos/isolamento & purificaçãoRESUMO
The achiral enynone shown cyclized to produce a tricyclic dienone that was converted in six steps to (-)-salviasperanol.