Absolute Structure of Panaxytriol.
作者:Mitsuru Satoh、Masayoshi Ishii、Mitsuo Watanabe、Kimiaki Isobe、Taketo Uchiyama、Yasuo Fujimoto
DOI:10.1248/cpb.50.126
日期:——
Diastereomeric mixture at C-3 of (9R, 10R)-panaxytriol acetonide (3) and (9S, 10S)-panaxytriol acetonide (4) were enantioselectively acetylated to give (3R)-acetates (3a-Ac, 4a-Ac) and (3S)-alcohols (3b, 4b) by enzyme mediated-acetylation using CHIRAZYME and vinyl acetate, respectively. Hydrolysis of (3R)-acetate (3a-Ac, 4a-Ac) with CHIRAZYME and phosphate buffer afforded (3R)-alcohols (3a, 4a), respectively. Deprotection of panaxytriol acetonides (3a, 3b, 4a, 4b) gave panaxatriol and its isomers, respectively. Comparison of optical rotation values of the synthetic panaxatriols with that of the natural one confirmed that the absolute configuration of panaxytriol sould be 3R, 9R, 10R.
通过使用 CHIRAZYME 和乙酸乙烯酯进行酶介导乙酰化,(9R, 10R)-panaxytriol acetonide (3) 和 (9S, 10S)-panaxytriol acetonide (4) C-3 处的非对映混合物被对映选择性乙酰化,分别得到 (3R)-acetates (3a-Ac, 4a-Ac) 和 (3S)-alcohols (3b, 4b)。用 CHIRAZYME 和磷酸盐缓冲液水解 (3R)-acetate (3a-Ac, 4a-Ac),分别得到 (3R)-alcohols (3a, 4a)。对三羟甲基丙酮(3a、3b、4a、4b)进行脱保护处理后,分别得到三羟甲基丙酮及其异构体。通过比较合成的三七酚与天然三七酚的旋光度值,证实三七酚的绝对构型应为 3R、9R、10R。