Synthesis of long chain n-3 and n-6 fatty acids having a photoactive conjugated tetraene group
作者:Dmitry V. Kuklev、William L. Smith
DOI:10.1016/j.chemphyslip.2004.02.006
日期:2004.7
Fatty acids of the n-3 and n-6 families containing a photoactive conjugated tetraene group near the carboxylate were prepared from several naturally occurring fatty acids by sequential iodolactonization and treatment with excess 1,8-diazabicyclo[5.4.0]undec-7-ene. The new conjugated fatty acids include 5E,7E,9E,11Z,14Z- and 5E,7E,9E,11E,14Z-eicosapentaenoic acids derived from arachidonic acid; 5E,7E
通过顺序的碘代内酯化并用过量的1,8-二氮杂双环[5.4.0] undec-7-处理,由几种天然存在的脂肪酸制备n-3和n-6家族,其中的羧酸在羧酸酯附近包含一个光敏共轭四烯基团的脂肪酸。烯。新的共轭脂肪酸包括衍生自花生四烯酸的5E,7E,9E,11Z,14Z-和5E,7E,9E,11E,14Z-二十碳五烯酸。来自二十碳五烯酸的5E,7E,9E,11Z,14Z,17Z-和5E,7E,9E,11E,14Z,17Z-二十碳六烯酸; 和来自二十二碳六烯酸的4E,6E,8E,10Z,13Z,16Z,19Z-和4E,6E,8E,10E,13Z,16Z,19Z-二十二碳六烯酸。所有新合成的脂肪酸均通过UV,1H NMR和质谱进行了表征。这些新产品代表了亚甲基间断双键系统定向共轭的第一个例子。可以以克量和高产率(> 50%)合成产物。有趣的是,即使使用温和的条件和不同的合成方法,也无法合成在羧基附近具有