Hyperisampsins AD (1-4), with tetracyclo[6.3.1.1(3,10).0(3,7)]tridecane skeletons and seven biogenetically related congeners (5=11), were isolated from Hypericum sampsonii. Their structures were elucidated by comprehensive spectroscopic techniques. The absolute configuration of 1 was established by ECD calculations, and those of 5 and 9 were confirmed by single X-ray crystallographic analyses. Hyperisampsins A and D showed potent anti-HIV activities with EC50 of 2.97 and 0.97 mu M and selectivity index of 4.80 and 7.70, respectively.
基金:
Program for New Century Excellent Talents in University, State Education Ministry of China [NCET-2008-0224]; National Natural Science Foundation of China [31370372, 31200258, 81202423]; National Science and Technology Project of China [2011ZX09102-004]