Stereoselective Synthesis of acis-1,2-Dialkylcyclopentane Building Block and Its Application in Isoprostane Synthesis (5-ent-F2c-IsoP)
作者:Petteri Elsner、Peter Jetter、Kerstin Brödner、Günter Helmchen
DOI:10.1002/ejoc.200800010
日期:2008.5
of the Corey lactone, has been prepared from a readily available nortricyclanone derivative by a five-step sequence in an overall yield of 34 %. This chiral building block has been applied in total syntheses of two diastereomeric isoprostanes belonging to the 5-F2 family: ent-5-F2c-IsoP (ent-1) and 5-epi-ent-5-F2c-IsoP (ent-2). Key features of the syntheses are the introduction of the two unsaturated
全顺式取代的环戊烷 3a 是 Corey 内酯的类似物,由易于获得的去甲三环酮衍生物通过五步序列以 34% 的总产率制备。这种手性构件已应用于属于 5-F2 家族的两种非对映异构异前列腺烷的全合成:ent-5-F2c-IsoP (ent-1) 和 5-epi-ent-5-F2c-IsoP (ent-2 )。合成的关键特征是通过 E 选择性 Horner-Wadsworth-Emmons 反应与碱敏感的合成醛 10 以及 Z 选择性 Wittig 烯化引入两个不饱和烷基侧链。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)