Electronspray Ionization

Three terpenes with Protostane type were isolated from the rhizomes of Alisma plantago- aquatica. The chemical structures of isolated compounds were characterized as 11 ,23S,24R,25- tetrahydroxyprotost-13(17)-en-3-one (alisol A, 1), 11 ,23S,25-trihydroxyprotost-13(17)-en-3- one-24R-yl acetate (alisol A acetate, 2), and 11 ,23S,24S-trihydroxyprotost-13(17),25-dien-3-one (alisol G, 3), by detailed analysis of the 1D- and 2D-NMR spectra such as 1 H-, 13 C-NMR, DEPT 90, DEPT135, HSQC, HMBC, 1 H- 1 H COSY, and by the Electronspray Ionization (ESI) mass spectrum.

6p uocvong04 24-09-2015 64 3   Download