was synthesized from naturally occurring cyclitol, L-quebrachitol via the conduramine derivative, which was prepared regio- and stereoselectively by the Pd-catalyzed azidation of the allyl carbonate derivative. Condensation of phytosphingosines with 2-acetoxy fatty acid residue, followed by glycosidation, furnished the total synthesis. This work established an effective synthetic pathway to a wide
描述了从海星中分离的新型脑苷脂、棘突脑苷脂 A (1) 和星形脑苷脂 A (2) 的手性和立体选择性全合成。1 和 2 中的植物鞘氨醇部分是通过二烷基镁试剂与常见的环氧化物中间体 2-(t-butoxycarbonyl)amino-1-O-(t-butyldiphenylsilyl)-2-deoxy-3-O-( 4-甲氧基苄基)-D-4,5-脱水核糖醇 (5)。环氧化物 (5) 是由天然存在的环醇、L-白木糖醇通过康杜拉明衍生物合成的,该衍生物是通过 Pd 催化的碳酸烯丙酯衍生物的叠氮化反应制备的。植物鞘氨醇与 2-乙酰氧基脂肪酸残基的缩合,然后是糖苷化,提供全合成。这项工作建立了一种有效的合成途径,可合成含有多种植物鞘氨醇和 2-羟基脂肪酸残基的多种脑苷脂;第一次全合成astrocerebroside A (2) 充分证实了所提出的结构。