灯盏花中的两种新异香豆素

Two novel isocoumarins from Erigeron breviscapus

从菊科植物灯盏花(Erigeron breviscapus(Vant.)Hand.-Mazz.)全草乙醇提取物中分离得到两个新颖的异香豆素类成分,命名为灯盏花酮C(1)和灯盏花酮D(2),其化学结构经波谱分析分别鉴定为8,9-dihydroxypyrano[3,2-c]isochromen-4,6-dione(1)和4,7-dihydroxy-3-(3-hydroxy-4-oxo-4H-pyran-2-yl)-1H-isochromen-1-one(2),二者分子结构中均连有罕见的γ-吡喃酮片段。

Two novel isocoumarins, erigeronone C （1） and D （2）, were isolated from the ethanol extract of the whole plant of Erigeron breviscapus （Vant.） Hand.-Mazz （Compositae）. Their structures were respectively elucidated as 8, 9-dihydroxypyrano [3, 2-c] isoehromen-4, 6-dione （1） and 4, 7-dihydroxy-3-（3-hydroxy-4-oxo- 4H-pyran-2-yl）-lH-isoehromen-l-one （2） on the basis of spectral analyses. Both structures of 1 and 2 possess a 7-pyrone moiety and that is rare in natural products.