The pure four stereoisomers of 3,ll-dimethyl-2-nonacosanone (1), the female-produced sex pheromone of the German cockroach, were synthesized starting from (R)-citronellol (2a) and ethyl (R)-3-hydroxybutanoate (3). The key step was the chromatographic separation of (5RS,6R)-6-hydroxy-5-methyl-2-heptanone (16a) to give pure (5R,6R- and) 5S,6R-isomers. All of the four stereoisomers of 1 were bioactive
从(R)-
香茅醇(2 a)和乙基(R)-3-开始合成3, ll-二甲基-2-壬二酮(1)(德国蟑螂的雌性性信息素)的四个纯立体异构体羟基
丁酸酯(3)。关键步骤是色谱分离(5RS,6R)-6-羟基-
5-甲基-2-庚酮(16 a),得到纯的(5R,6R-和)5S,6R-异构体。所有四种立体异构体的1是
生物活性的。