Isoechinulin-type Alkaloids, Variecolorins A–L, from Halotolerant Aspergillus variecolor
摘要:
Twelve new compounds, variecolorins A-L (1-12), together with eleven known analogues (13-23) were isolated from the broth of a halotolerant fungus, Aspergillus variecolor. The structures of compounds 1-12 were determined by chemical and spectroscopic methods. Compounds 1-11, 13-15, and 20-23 exhibited weak radical scavenging activity against DPPH, with IC50 values from 43 to 103,mu M. The new compounds 1-12 all were essentially nontoxic against the P388, HL-60, BEL-7402, and A-549 cell lines with IC50 values from 70 to 260 mu M.