Sarcophytol A (1a), a potent anti-tumor-promotor cembranoid from the soft coral Sarcophyton glaucum, was subjected to various oxidation reactions. m-Chloroperbenzoic acid oxidation of 1a gave two epoxides (2a, 2b) which were converted to the corresponding diols 6b, 11b, 12b, 12'b and triols 4b, 9b. Lithium aluminum deuteride reduction of 2a gave a C-7 monodeuterated diol; this was used as a model experiment for the tritiation of 1a. Chromic acid oxidation of 1a gave seco-cembranoids 13b-18, a dienone 19, and a dihydrofuran derivative 20a. Sarcophytol A acetate (1b) was less reactive in chromic acid oxidation and afforded a seco-aldehyde 22a and a dihydroxy derivative 23a in low yield. Hydrolysis of 22a followed by acid treatment afforded the furan 18. Hydrolysis of 23a gave a triol, which, on further oxidation, gave the aldehyde 16, the major product of the chromic acid oxidation of 1a.
1a 的间
氯过
苯甲酸氧化反应产生了两个
环氧化物(2a、2b),并转化为相应的二醇 6b、11b、12b、12'b 和三醇 4b、9b。
氘化铝
锂还原 2a 后得到 C-7 单
氘化二元醇;这被用作 1a 三
氘化的模型实验。
铬酸氧化 1a 得到仲
碳酸酯 13b-18、二烯酮 19 和二氢
呋喃衍
生物 20a。Sarcophytol A
乙酸酯(1b)在
铬酸氧化中的反应性较低,可得到仲醛 22a 和二羟基衍
生物 23a,但产量较低。
水解 22a 并进行酸处理后可得到
呋喃 18。
水解 23a 得到三醇,进一步氧化后得到醛 16,这是 1a 的
铬酸氧化反应的主要产物。