For mechanistic studies on the lipoxygenase reaction, the special substrate fatty acids (5Z,8Z,11Z,14Z)-nonadeca-5,8,11,14-tetraene-1,19-dioic and (5Z,8Z,11Z,14Z)-20,20-dimethylheneicosa-5,8,11,14-tetraenoic acids were synthesized. The synthetic scheme involves a joint route for the formation of (5Z,8Z,11Z,14Z)-nonadeca-5,8,11,14-tetraene-1,19-dioic acid, which is based on the polyacetylenic approach. Regioselective reduction of the Ï-carboxylic group to the primary alcohol, exchange of an OH-group to corresponding iodine and subsequent coupling with low-order organocuprates (t-Bu2CuLi) resulted in the formation of (5Z,8Z,11Z,14Z)-20,20-dimethylheneicosa-5,8,11,14-tetraenoic acid with an overall yield of 11%.
为了对
脂肪氧化酶反应进行机理研究,合成了特殊底物
脂肪酸 (5Z,8Z,11Z,14Z)-nonadeca-5,8,11,14-tetraene-1,19-dioic 和 (5Z,8Z,11Z,14Z)-20,20-dimethylheneicosa-5,8,11,14-tetraenoic acids。该合成方案涉及一条形成(5Z,8Z,11Z,14Z)-
壬二酸-5,8,11,14-四烯-1,19-二酸的联合路线,该路线基于多
乙炔法。将Ï-羧基区域选择性还原为伯醇,将一个羟基交换为相应的
碘,然后与低阶有机
琥珀酸盐(t-Bu2CuLi)偶联,形成了(5Z,8Z,11Z,14Z)-20,20-二甲基二十碳-5,8,11,14-四烯酸,总产率为 11%。