摘要
Six new ent-abietane diterpenoids,abientaphlogatones A−F(1−6),along with two undescribed ent-abietane diterpenoid glucosides,abientaphlogasides A−B(7−8)and four known analogs were isolated from the aerial parts of Phlogacanthus curviflorus(P.curviflorus).The structures of these compounds were determined using high-resolution electrospray ionization mass spectrometry(HR-ESI-MS),one-dimensional and two-dimensional nuclear magnetic resonance(NMR)spectroscopy,electronic circular dichroism(ECD)spectra,and quantum chemical calculations.Notably,compounds 5 and 6 represented the first reported instances of entnorabietane diterpenoids from the genus Phlogacanthus.In theβ-hematin formation inhibition assay,compounds 2,4,7−10,and 12 displayed antimalarial activity,with IC_(50) values of 12.97−65.01μmol·L−1.Furthermore,compounds 4,5,8,and 10 demonstrated neuroprotective activity in PC12 cell injury models induced by H_(2)O_(2) and MPP+.
