5-Alkylidenecyclopent-2-enones 15aâq may be prepared via a conjugate additionâPeterson olefination sequence, best achieved in one-pot, using exo-2-trimethylsilyl-3a,4,7,7a-tetrahydro-4,7-methanoinden-1-one 12, followed by a retro-DielsâAlder reaction. The geometry of the exocyclic alkene may be controlled according to the use of organometallic species in the conjugate addition step; organocuprate reagents are found to selectively lead to the formation of E-exocyclic alkene adducts, whereas Grignard reagents favour the formation of Z-alkenyl isomers. The use of enantiomerically enriched 12, accessed from an asymmetric PausonâKhand reaction, affords the corresponding enantioenriched 5-alkylidenecyclopent-2-enones and this approach is exemplified by the short, stereoselective total syntheses of two cyclopentenone phytoprostanes 51 and 13,14-dehydrophytoprostane J165. The ability of this family of synthetic compounds to activate the peroxisome proliferator activated receptor-γ is reported.
5-烷叉环戊-2-
烯酮15a–q可通过共轭加成-Peterson
烯化序列制备,最佳方法为在一锅中使用外型2-三
甲基硅基-3a,4,7,7a-四
氢-4,7-亚
甲基茚-1-
酮12,接着进行逆Diels-Alder反应。根据共轭加成步骤中使用的有机
金属物种,可以控制外部
烯烃的几何形状:
有机铜酸盐试剂发现选择性地导致E-外
烯烃加合物的形成,而Grignard试剂有利于Z-
烯基异构体的形成。使用手性富集的12(通过不对称Pauson-Khand反应获得),得到相应的手性富集的5-烷叉环戊-2-
烯酮,这种方法通过两个
环戊烯酮植物激素51和13,14-
脱氢植物激素J165的简短、立体选择性全合成得到了例证。报道了这一系列合成化合物活化
过氧化物酶体增殖物激活受体-γ的能力。