Synthesis, properties, and identification of epimeric hepoxilins (−)-(10R)-B3 and (+)-(10S)-B3
作者:Ludmila L. Vasiljeva、Tatjana A. Manukina、Peter M. Demin、Margarita A. Lapitskaja、Kasimir K. Pivnitsky
DOI:10.1016/s0040-4020(01)89921-x
日期:1993.5
individual epimers of hepoxilin B3, a new total synthesis procedure was developed consisting of subsequent condensations of enentiomerically pure (2R,3S)-epoxy-5-undecynal with LiCCCH2Cl and HCC(CH2)3COOMe, followed by Lindlar hydrogenation, and finally epimer separation. Derivatives of hepoxilin -(10R,11R,12S)-B3 (free acid, methyl ester and acetate of methyl ester) are more polar on silica gel, have
为了表征hepoxilin B的个别差向异构体3,一个新的总合成方法的开发由enentiomerically纯的(2R,3S)的随后的缩合的-环氧-5- undecynal与LiCCCH 2 Cl和HCC(CH 2)3 COOMe,然后进行Lindlar加氢,最后分离差向异构体。Hepoxilin- (10R,11R,12S)-B 3的衍生物(游离酸,甲酯的甲酯和乙酸甲酯)在硅胶上更具极性,旋光度为负[α] 25 D -60.6°,-62.6°,分别为-25.2°和1 H NMR光谱中的羧酸H-10信号分裂较大(J 10,115.0–6.1 Hz)。极性较小的苏木精-(10S,11R,12S)-B 3衍生物的相应值为:[α] 25 D + 73.5°,+ 61.9°和-2.0°;J 10-11 2.95-3.3 Hz。这些数据表明,最近由WHGerwick等人分离的Hepoxilin B