中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
肉豆蔻醛 | 3-Methoxy-4,5-methylenedioxybenzaldehyde | 5780-07-4 | C9H8O4 | 180.16 |
7-甲氧基-1,3-苯并二氧化物-5-甲醇 | (7-methoxybenzo[d][1,3]dioxol-5-yl)methanol | 22934-59-4 | C9H10O4 | 182.176 |
—— | combretastatin A-2 | 111394-44-6 | C17H16O5 | 300.311 |
—— | 3'-hydroxy-3,4-methylenedioxy-4',5-dimethoxy-(E)-stilbene | 111394-53-7 | C17H16O5 | 300.311 |
甲基 7-甲氧基苯并[d][1,3]二氧代-5-羧酸 | methyl 7-methoxybenzo[d][1,3]dioxole-5-carboxylate | 22934-58-3 | C10H10O5 | 210.186 |
Further investigation of the South African tree Combretumcaffrum (Combretaceae) for murine P388 lymphocytic leukemia (PS) cell-growth inhibitory substances has led to discovery of three new active constituents designated combretastatins A-2 (5a, PS ED50 0.027 μg/mL), A-3 (5b, PS ED50 0.026 μg/mL), and B-2 (3b, PS ED50 0.32 μg/mL). Both combretastatins A-2 and A-3 were found to markedly inhibit tubulin polymerization. The structure of each combretastatin was firmly established by a combination of high resolution (400 MHz) 1H and 13C nuclear magnetic resonance and mass spectral analyses followed by total syntheses. The conversion of methyl gallate (7b) to combretastatin A-2 via intermediates 7c → 7d → 7e → 7a and 6a → 5a illustrates the practical synthetic route utilized for obtaining these substances. The Wittig reaction employed as the penultimate step in obtaining combretastatins A-3, afforded predominantly the natural Z isomer.