N-Hydroxypyridone alkaloids, chromone derivatives, and tetrahydroxanthones from the scale-insect pathogenic fungus Orbiocrella sp. BCC 33248
作者:Masahiko Isaka、Rachada Haritakun、Sumalee Supothina、Wilunda Choowong、Suchada Mongkolsamrit
DOI:10.1016/j.tet.2014.10.029
日期:2014.12
Six new compounds, an N-hydroxypyridone glucoside, orbiocrellin A (1), its aglycone orbiocrellin B (2), chromone glucosides 3 and 4, a dihydrochromone 5a/5b, and a chromone 6, were isolated from the scale-insect pathogenic fungus Orbiocrella sp. BCC 33248. Orbiocrellin A (1) exhibited antimalarial activity against Plasmodium falciparum K1 (IC50 3.1 mu g/mL) while it was non-cytotoxic. In contrast, orbiocrellin B (2) showed both antimalarial (IC50 2.1 mu g/mL) and cytotoxic (NCI-H187 cells, IC50 0.70 mu g/mL) activities. (C) 2014 Elsevier Ltd. All rights reserved.