New Eudesmane Derivatives from <i>Melampodium </i><i>c</i><i>amphoratum </i>from the Suriname Rainforest
作者:V. S. Prakash Chaturvedula、Afgan Farooq、Jennifer K. Schilling、S. Malone、Iwan Derveld、Marga C. M. Werkhoven、Jan H. Wisse、Michel Ratsimbason、David G. I. Kingston
DOI:10.1021/np049696q
日期:2004.12.1
Bioassay-guided fractionation of an EtOAc extract of the leaves of Melampodium camphoratum using an assay for inhibitors of the degradation of hemin resulted in the isolation of six new eudesmane sesquiterpenes (1-6) and the known 6-epi-beta-verbesinol coumarate (7). The structures of compounds 1-6 were established as 6alpha-(4'-O-methyl-7'E-coumaryloxy)eudesm-4(14)-ene (1), 6alpha-(4'-O-stearyl}
生物测定引导下的樟脑叶提取物的EtOAc提取物使用血红素降解抑制剂的测定方法进行分离,结果分离出6种新的常松香倍半萜(1-6)和已知的6-epi-β-verbesinol香豆酸酯( 7)。化合物1-6的结构确定为6alpha-(4'-O-甲基-7'E-香豆氧基)eudesm-4(14)-烯(1),6alpha-(4'-O-硬脂基}- 7'E-库玛芳氧基)eudesm-4(14)-烯(2),6alpha-(4'-O-棕榈基} -7'E-库玛芳氧基)eudesm-4(14)-ene(3),6alpha- (4'-O- [9'Z-十六烯酰基]}-7'E-香豆氧基)eudesm-4(14)-烯(4),6alpha-(7'Z-香豆氧基)eudesm-4(14) -烯(5)和6α-(4'-乙酰氧基} -7'Z-香豆氧基)eudesm-4(14)-烯(6)。化合物1-4在血红素降解试验中显示出弱的活性,而化合物5-7则没有活性。