were designed, synthesised and evaluated for their α-glucosidase inhibitory and cytotoxicactivities. Among synthetic derivatives, lupeol analogues 2b and 2e containing a benzylidene chain exhibited the best activity against α-glucosidase and superior to the positive agent with the IC50 values of 29.4 ± 1.33 and 20.1 ± 0.91 μM, respectively. Lupeol analogues 2d and 3a showed weak cytotoxicity against
beta-acetoxy-28-nor-lup-12,17-dien-16 alpha-ol and 28-nor-lup-12,17-dien-3 beta-ol-16-one, respectively, together with 30-nor-lup-3 beta-ol-20-one, taraxeryl acetate and germanicol, were isolated, from the aerial parts of Koelpinialinearis. 13C-NMR shifts were assigned after performing APT and DEPT experiments.
Abstract Two new triterpenoids were isolated together with β-amyrin acetate, taraxeryl acetate, lupenyl acetate, 3β-acetoxy-30-norlupan-20-one, α-amyrenonol and sitosterol from the whole herb of Euphorbiamaculata. The structures of the new compounds were characterized as gult-5-en-3β-yl acetate and ursa-9(11):12-dien-3β-ol on the basis of chemical and spectral evidence.