Oxidation of octadecatrienoic acids in the red alga Lithothamnion corallioides: structural and stereochemical studies of conjugated tetraene fatty acids and bis allylic hydroxy acids
作者:Mats Hamberg
DOI:10.1039/p19930003065
日期:——
15-tetraenoic acid (α-parinaric acid; 5a), (11S,9Z,12Z,15Z)-hydroxyoctadeca-9,12,15-trienoic acid 6a, and (14R,9Z,12Z,15Z)-hydroxyoctadeca-9,12,15-trienoic acid 7a. Isotope studies demonstrated that enzymatic conversion of the acid 1a into the tetraene 2a was accompanied by stereospecific eliminations of the pro-S and pro-R hydrogens from C-8 and C-11, respectively. The bis allylic hydroxy acid 3a was formed
在制备红藻藻胆石破珊瑚的过程中酶促氧化(6 Z,9 Z,12 Z)-octadeca-6,9,12-三烯酸(γ-亚麻酸; 1a)导致形成(6 Z,8 E,10 E,12 Z)-十八烷基-6,8,10,12-丁烯酸2a和(11 R,6 Z,9 Z,12 Z)-羟基十八烯-6,9,12-三烯酸3a作为主要产品。(9 Z,12 Z,15 Z)-十八烷基-(9,12,15)-三烯酸(α-亚麻酸; 4a)以类似的方式氧化,得到(9 Z,11 E,13 E,15 Z)-octadeca-9,11, 13,15-丁烯酸(α-二十二烷酸; 5a),(11 S,9 Z,12 Z,15 Z)-羟基十八烷基9,12,15-三烯酸6a和(14 R,9 Z,12 Z,15 Z)-羟基十八烷基-9,12,15-三烯酸7a。同位素研究表明,酸1a酶转化为四烯2a伴随有立体定向消除C-8和C-11的pro - S和pro