Two New Benzofuranes from<i>Eupatorium aschenbornianum</i>and their Antimicrobial Activity
作者:Rios, Maria Yolanda、Aguilar-Guadarrama, A. Berenice、Navarro, Victor
DOI:10.1055/s-2003-45113
日期:2003.10
Through a bioassay-guided fractionation, from the aerial parts of the medicinal plant Eupatorium aschenbornianum were isolated two new benzofurane compounds, 5-acetyl-3β-angeloyloxy-2β-(1-hydroxyisopropyl)-2,3-dihydrobenzofurane (1) and 5-acetyl-3β-angeloyloxy-2β-(1-hydroxyisopropyl)-6-methoxy-2,3-dihydrobenzofurane (2) in addition to 4-hydroxy-3,5-diprenylacetophenone, espeletone (3), encecalinol (4), β-sitosterol and stigmasterol. The antimicrobial evaluation of these natural products showed that 1 [MIC = 200 μg/mL against T. mentagrophytes and 100 μg/mL against T. rubrum], 2 [MIC = 50 μg/mL towards both] and 3 [MIC = 100 μg/mL against both] were active against dermatophytes, while 4 was active against all of microorganisms assayed [MIC = 12.5 μg/mL (T. mentagrophytes), 12.5 μg/mL (T. rubrum), 100 μg/mL (C. albicans) and 200 μg/mL (A. niger)].
通过生物测定指导的分离方法,从药用植物泽兰(Eupatorium aschenbornianum)的地上部分分离出两种新的苯并呋喃化合物,即5-乙酰基-3β-当归酰氧基-2β-(1-羟基异丙基)-2,3-二氢苯并呋喃(1)和5-乙酰基-3β-当归酰氧基-2β-(1-羟基异丙基)-6-甲氧基-2,3-二氢苯并呋喃(2),此外还有4-羟基-3,5-二异丙基乙酰苯、espeletone(3)、encecalinol(4)、β-谷甾醇和豆甾醇。这些天然产品的抗菌评估显示,1号化合物对皮肤癣菌有活性[MIC = 200 μg/mL(对T. mentagrophytes)和100 μg/mL(对T. rubrum)],2号化合物对两种皮肤癣菌均有活性[MIC = 50 μg/mL],3号化合物对两种皮肤癣菌也有活性[MIC = 100 μg/mL],而4号化合物对所有检测的微生物均有活性[MIC = 12.5 μg/mL(对T. mentagrophytes),12.5 μg/mL(对T. rubrum),100 μg/mL(对C. albicans)和200 μg/mL(对A. niger)]。