The sphingolipids 1a, b and 2a, b which play important roles in epidermal barrier function, were synthesized by N-acylation of C18-sphingosine 3 and 1-O-glucosylated C18-sphingosine 6, respectively, with ω-acyloxy-substituted fatty acids 4 and 5 (Scheme 1). These fatty acids were obtained from ω-hydroxy-substituted fatty acids 8 and 9 by esterification with linoleic acid (7). The C34-fatty acid 8 was
在表皮屏障功能中起重要作用的鞘脂1a,b和2a,b通过分别用ω-酰氧基取代的C 18-
鞘氨醇3和1- O-
葡萄糖基化的C 18-
鞘氨醇6进行N-酰化来合成
脂肪酸4和5(方案1)。这些
脂肪酸通过用
亚油酸(7)酯化而从ω-羟基取代的
脂肪酸8和9获得。C 34-
脂肪酸如下制备图8:通过C 13-醛13与C 12 -on盐15或C 12-醛24与C 13 -on盐21的维蒂希反应分别得到C 25-化合物18,和随后氢化和O-脱保护(方案2)。或者,通过
铜催化将C 13烷基卤化物19与
格氏试剂偶联,通过30制备8。衍生自C 12烷基
溴化物14的试剂(方案2)。在O-脱保护后(方案3),将18氧化为醛39并与C 9 -phosph盐41进行Wittig反应,得到了所需的ω-羟基取代的
脂肪酸8。类似地,维悌希的C反应11 -
鏻盐22为C 12 -醛24布置Ç 23 -醛40,氢化后,ö-脱保护和氧化;与